tomch
789
UFA Spring Drive: New on the Block.
Exciting discovery: absolutely fascinating movement with sensational accuracy. Beautiful in 37mm with a misthic dial from the Japanese culture.
New Release
Explore Grand Seiko's 2025 Watches & Wonders releases, featuring the Spring Drive Caliber 9RB2 with ±20 sec/year Ultra Fine Accuracy and new micro-adjust clasps.
21 replies3311 views
New Release
Explore the Grand Seiko Spring Drive U.F.A. Ref. SLGB006 in 18k yellow gold, featuring the Calibre 9RB2 and an Ice Forest at Dawn dial. Limited to 80 pieces.
22 replies634 views
Reference Guide
Explore Grand Seiko's Evolution 9 'White Birch' models, comparing the Hi-Beat 9SA5 and Spring Drive 9RA2 movements. Learn about GS design and technical details.
15 replies7402 views
New Release
Discover the Grand Seiko Tentagraph SLGC009, the brand's first mechanical chronograph. Cazalea details its Caliber 9SC5, Hi-Beat movement, and 3-day power reserve.
19 replies5659 views
New Release
Discover the Grand Seiko SLGA021 'Lake Suwa Before Dawn' with its unique textured dial and Caliber 9RA2 Spring Drive movement. Explore its 5-day power reserve and Evolution 9 design.
6 replies4417 views
Reference Guide
Explore the Grand Seiko Tentagraph, the brand s first mechanical chronograph. Discover the Caliber 9SC5, its unique features, and all six reference variants including SLGC001 and SLGC009.
28 replies1077 views
UFA Spring Drive: New on the Block.
Exciting discovery: absolutely fascinating movement with sensational accuracy. Beautiful in 37mm with a misthic dial from the Japanese culture. ...
Congrats!
It’s a great size at 37mm instead of all these 40-42s, much more classical looking. If you can, please let us know in a couple months the real accuracy of the movement. The Japanese generally downplay a lot the actual precision of their movements, for exa...
The movement in your SLGA021 has all the same tech as the UFAs
They even have a spot for a regulator switch, which is unused and hidden below the plates.
Oh I didn’t know that there was a spot for the regulator.
So I wonder why the difference for stated accuracy intervals, for the caliber 9RA2 it’s +-10s a month but for the UFA it’s +-20s a year. I thought maybe they were using a better quartz crystal or something.
The UFA does use selected crystals that have been aged and confirmed as most accurate in a batch
Here’s the watch’s special page LINK TO GS PAGE From the press release: The new movement achieves its ±20-seconds-per-year accuracy thanks to new and enhanced manufacturing and processing methods for the three-month-aged quartz oscillator, and a newly des...
So they produce better quartz +
the IC is better. Wonder when they will achieve to have an IC that can work with an AT cut quartz in a spring drive, that would probably be the ultimate accuracy. Thank you sir!
Seiko Epson goes by JIS standard no. B7025 for rating accuracy, which requires a few years of crystal aging date that didn't exist when the 9RA movements were launched
Seiko Epson released a technical paper on the 9RA movements years ago, they knew the 9RA movements could perform to +/-10 seconds a year when new. You can access a PDF of the paper from this site, but it is in japanse. www.jstage.jst.go.jp...
I didn’t know that hot weather made
the quartz slower and cold faster, thanks. Also I thought that they were aging the cristals for 3 months and not for years. Wonder how the 9RA movements will preform after a decade.
This spot here is where the regulator would go
The little cutout and pin sticking through the perimeter plate are for it. There are also contacts for it are on the PCB, but afaik none of the 9RA movements have the switches installed. ...
It should be almost impossible to measure the accuracy of this watch
You will have to wear it all the time, for months, to see variations, and what reference signal can you compare it to? I don’t change my high-accuracy quartz watch for daylight savings. It’s now jumping 2 seconds, meaning the battery needs to be changed a...
Beautiful dial with lions!
I did exactly the thing you proposed sir, I wore my SLGA021 daily at home for months. When I was going out I sometimes changed to other pieces but at home committed to it, the 5 days power reserve helped too when for a day or two I wore other watches. It ...
Truly sublime 👏🏻🙌🏻👌🏻
Love everything about it, and the size is spot on 👍🏻 Great shots, too 😊🙌🏻
