TimeTravel #2: Seiko 8T23-8020 Full-Cost Sign

HomeTime TravelTimeTravel #2: Seiko 8T23-8020 Full-Charge Signal

Time TravelSeiko
TimeTravel #2: Seiko 8T23-8020 Full-Charge Signal
The world’s first manually wound quartz movement

by Tomas Rosputinsky

December 10, 2019 MIN READ

TimeTravel #2: Seiko 8T23-8020 Full-Charge Signal

Imagine it takes three long minutes to wind your watch. And imagine that the watch you’re winding is quartz powered. Crazy? Meet the Seiko 8T23-8020 Full-Charge Signal.

If you remember our first TimeTravel article about the Tissot RockWatch, you already know we are on a mission to bring often overlooked watches born between 1980 to early 2000 to the spotlight. In this second edition, we are sticking to the quartz. But beware, it’s not your typical quartz watch. Today we take a look at the one of a kind Seiko 8T23-8020 from 1986 that bears the title of the world’s first manually wound quartz watch.

Seiko 8T23-8020
Image source:

HomeTime TravelTimeTravel #2: Seiko 8T23-8020 Full-Cost Sign

TimeTravel #2: Seiko 8T23-8020 Full-Cost Sign
The world’s first manually wound quartz motion

by Tomas Rosputinsky

December 10, 2019 MIN READ

TimeTravel #2: Seiko 8T23-8020 Full-Cost Sign

Think about it takes three lengthy minutes to wind your watch. And picture that the watch you’re winding is quartz powered. Loopy? Meet the Seiko 8T23-8020 Full-Cost Sign.

In case you bear in mind our first TimeTravel article in regards to the Tissot RockWatch, you already know we’re on a mission to convey typically neglected watches born between 1980 to early 2000 to the highlight. On this second version, we’re sticking to the quartz. However beware, it’s not your typical quartz watch. At the moment we check out the considered one of a form Seiko 8T23-8020 from 1986 that bears the title of the world’s first manually wound quartz watch.

Seiko 8T23-8020

Picture supply:

Seiko has two first quartz watches

Just lately right here on Fratello, we launched Seiko’s Quartz Astron 50th Anniversary Limited Edition commemorating the world’s first quartz watch born in 1969. So why would Seiko ‚step again‘ greater than a decade later and develop a quartz watch that must be wound? Simply as folks needed to change worn tires as soon as each few seasons, the identical needed to be performed with batteries in quartz watches. Within the mid-eighties, quartz was the usual. Eliminating previous batteries was not simple, so the sensible folks at Seiko determined to give you an answer on the best way to give the environment a little bit break. And, on the identical time, present the world what it’s wish to be the primary once more.

Picture supply:

Capacitor vs Battery

In 1986, seventeen years after introducing the primary quartz watch, Seiko Devices Inc. revealed a newly developed 8T23 caliber, the world’s first-hand wound quartz. The precept was fairly easy. By winding the crown, a small electrical generator expenses a capacitor, that’s subsequently capable of energy the quartz motion. Because of the ‚comfortable‘ crown, the capacitor could be recharged repeatedly and the watch proprietor by no means has to cope with a lifeless battery. It is sort of a predecessor of the Kinetic actions.

A 3-day energy reserve

Flipping by means of the pages within the Historical past of the fashionable wristwatch e book by Pieter Doensen I discovered a few explanations as to why the story of the Seiko 8T23 ended as rapidly because it started. ‘To provide the supercapacitor with sufficient vitality for Three days, a number of minutes of winding by hand are required.‘ Anthony Kable in his article confirms the story by saying, ‚the designers specified the goal of a 3 minute winding time to go from fully discharged to a full capacitor.’ I suppose an authentic handbook to the watch would verify the actual fact.

Picture supply:

When the thought is healthier than the execution

Effectively, being a classic watch fanatic I’d not thoughts winding my Seiko 8T23 even for 5 minutes, I suppose… As soon as each few weeks. However in a time when tens of millions of individuals almost forgot what winding a watch means, I suppose it wasn’t the most popular advertising and marketing gross sales level. Sadly, even the LED on the 6 o’clock that was able to sign with a flash that the capacitor shouldn’t be hungry anymore didn’t assist.

Huge crown. Huge like.

Do you consider onions and pilots if any person asks you about huge crown watches? Any longer you gained‘t. Only one take a look at this Seiko 8T23 is sufficient to ensure you’ll by no means have the ability to un-see its crown. We already know that the watch builders have been conscious of the lengthy winding process. At the least with this crown, they needed to make it much less of a trouble, it’s huge, fats and properly textured. With no fancy form, it appears to be like like a giant vast runway prepared in your fingertips to land and roll over it.

Picture supply:

Elegant or sporty?

The Seiko 8T23 with a Full Cost Sign title on the dial was accessible in two completely different variations. The mannequin with the code SBAD001 had lume plots and no numbers on the hour indexes, whereas the second mannequin coded SBAD003 was sportier and got here with a minute observe on the hourly indexes. It would solely be me, however wanting on the different fashions sitting within the catalog subsequent to it, the 8T23 is a particular winner.

Picture supply: Anthony Cable,

By the best way, resulting from its form, proportions and clear dial, it jogs my memory a little bit of the Porsche Design IWC. The sportier SBD003 has a pink minute observe and Seiko brand, each characteristic a day/date aperture at three and a full-charge diode at 6. Each are cased in 35mm diameter and strapped with a stitched gray leather-based strap that includes a signed buckle. Each fashions have been bought for ¥28,000 at the moment, ¥3,000 greater than Seiko asked for the Voice Note M516-4009.

Seiko 8T23 defined. A bit.

The revolutionary Seiko 8T23 motion seemed on one hand like a standard quartz watch and as an influence plant on the opposite. To raised perceive the technicality behind it, I’ll assist myself with a quote by Anthony Kable: ‘When the crown is turned, the rotational pressure is amplified through the ability prepare and transmitted to the generator the place AC energy is created. The AC energy is then rectified by a rectifier circuit to cost the capacitor. This capacitor is used as an influence supply to provide an IC that detects the voltage accessible and the charging course of. As soon as the capacitor has been totally charged the overcharge prevention circuit is engaged and the charged LED is activated.’ In case you’re all in favour of extra technical particulars, I recommend you check out Anthony’s detailed article.

Picture supply: Anthony Cable,

Finish-of-Life Battery Indicator

When the watch begins to run low on energy, it can begin to transfer the second hand in two-second increments (many ETA quartz actions with this characteristic have a 5 seconds interval). If the person winds the watch and stops as quickly because the second-hand returns to regular operation, the watch will final for about 30 hours of operation. If you wish to have a extra practical video really feel, I give you this video I found on Instagram.

Picture supply: Anthony Cable,

Pleased unhappy finish

As this primary manually wound quartz motion was produced for barely a yr, it makes my eyes nicely up. However understanding that this know-how was a warmup spherical for Seiko’s subsequent growth of the A.G.S. or Automated Producing System (in a while, in 1991, it was branded Kinetic), there’s a want to succeed in for a handkerchief. Design-wise and technology-wise I think about this gem to be a little bit miracle. It’s not solely the primary however most likely additionally the one manually wound quartz motion. Due to this fact, I hope I discover one quickly and re-home it into my assortment of watch oddities.

Watch of the Week

MeisterSinger Circularis Automatic Old Radium

Partner Content

December 09, 2019

Brand of the Month

BALTIC Watches

Our imaginative and prescient of horology, impressed by the previous, made for at this time.

Partner Content

December 01, 2019

Topic of the Week


Swiss Made Watches

Partner Content

November 04, 2019

Time Journey

Time Travel #1: The 1980s Tissot RockWatch

Coronary heart-warming story a couple of stone chilly quartz masterpiece

by Tomas Rosputinsky

November 11, 2019


#TBT A Vintage Seiko Buyer’s Guide to Affordable Goodness

by Michael Stockton

September 20, 2018

You Asked Us: Tissot Powermatic 80 Seastar 1000 or Longines HydroConquest

by Robert-Jan Broer

September 05, 2018

New Hamilton Intra-Matic Auto Chrono – An Introduction (with live pictures)

by Balazs Ferenczi

August 31, 2018

Tomas Rosputinsky

In regards to the writer

Tomas Rosputinsky

Through the day time, Tomas is an entrepreneur within the promoting, automotive and IT software program industries. At night time he turns right into a watch fanatic looking for quirky actions or classic items with robust tales behind. Tomas was born and bred… read more

Watch evaluations in your inbox.

Even when it’s not Speedy Tuesday.

This iframe incorporates the logic required to deal with Ajax powered Gravity Varieties.Original Article

Leave a Reply

Your email address will not be published. Required fields are marked *