Very nice. What does the second crown at 2 o'clock set?

When I think of RGM, it’s primarily for their in house movements they make. This one that you show is an ETA 7751 based Watch, so you’re just buying an RGM case/dial with this. Don’t worry about repair. There are so many brands that have 7751 and of course you can buy the movement new for total movement replacement for around $700

Thanks for sharing the watch pics! There are a few I want to take a closer look at now in a future windup fair, like the citizen, minase, and Xeric. I agree that the Accutron is better in person. Last year windup fair got me hooked on that. Regarding SanFran weather…. I still have my lifelong lesson tourist scalping priced Alcatraz sweatshirt that I was forced to buy because it was in the 50’s and I had just come from San Jose in a t-shirt where it was in the 90’s.

You might be comparing apple to oranges. The 60’s era first gen Daytona had a Valjoux wind up movement (not automatic). Rolex was behind the game on *automatic* chronographs when the market dictated they needed one and so adopted Zenith’s El Primero in Rolex’s second generation of Daytona. However they did several modifications to it, such as removing date, slowing beat frequency from 5 to 4, changing spring material, etc.

I use an app called “Watchtimes” which is designed just for this application. Unfortunately it doesn’t use the camera to but rather it depends on a user pressing a button when the watch is at particular time, and then records the offset from atomic. I think this is fine for typical mechanicals, but it’s pain for spring drive, because it does require one to be at the top of their game. I use bright light and a mangified view, and still there is plenty of human error that averages out over many samplings. Here are some screen shots from my two springdrive. You can’t see all of the data points as they scroll off the bottom. The 9RA6 (SLGA015) is over a month of daily logs, and my 5R65 ( SBDB013) over two weeks.

You can see the slope is quite consistent. The small fluctuation I attribute to human recording error since these times verge near human limits (or at least mine). The straight slope suggests to me spring drives are capable of far greater precision if they are regulated.

On a balance spring watch, accuracy is affected by power and so can be related to power reserve depending on usage. This isn’t true with spring drive. My spring drive watches maintain their accuracy up until the moment they stop. Further, my daily logging of springdrive accuracy over many weeks leads me to believe their accuracy has more to do with set factory regulation tolerance than anything else…I.e their gain per day is consistent and predictable. My 9RA6 is a consistent +1.8 sec per month, and my 5R65 is a consistent +5.4 sec per month. I’m intrigued by the gold rotor badged spring drives which are supposedly maunually and individually regulated at the factory. Would love to hear some user timings on those.

Nice distributor touch for it to arrive by post with the date set (and presumably the time). Enjoy!