TexOmega
·Those crazy Swiss, they're a riot at parties, too.😁
At least they put those little arrows.....finally!
At least they put those little arrows.....finally!

I had a 435 (17j) and wanted this 433 (17j) to slot into my later day Ball collection. And it really has a nice dial. And times well.
From my understanding, the 435B and 435C are 21j and were actually accepted as RR grade in the mid 1950's.
The US regulations always specifically excluded Swiss made pws from being even considered as RR grade, so I guess the regulations changed around that time.
A favorite for 25 years. And rare as hens teeth capped in gold.
I have spent some time trying to draw a conclusion as to what grade number the Hamilton Watch Co. would have called the Ball grade 999 posted by @TexOmega . What has me puzzled is the regulator on every 18-size Hamilton is like the regulator on my Hamilton grade 927 pictured below. A Goldthwait regulator.
But the regulator on this particular Ball grade 999 is different! The picture (below) is from an 18-size Ball grade 999 which appears on the pocketwatchdatabase site, and it is the same regulator as on the Ball posted by @TexOmega. And the barrel bridge on the Grade 999 posted by @TexOmega is different to the barrel bridge on my grade 927 (posted above), and also different to the one shown on the pocketwatchdatabase site. The only conclusion I can draw is that Ball made changes to the base calibre made by Hamilton, and those changes are reflected here.
The 18s Ball models look to be Hamilton Model 1s, whereas your 927 is a Model 2. My best guess in the difference in the barrel bridge on Tex's Ball and every other 18s Hamilton I've seen is that it was a special request from Ball that was discontinued after a run or two.
I suppose that your supposition is the one that makes the most sense. Ball, for whatever reason, requested a different regulator, and Hamilton obliged.
Sadly, we pw buffs are still relegated to the “Open” sub forum.
I requested a promotion to the Big Boy Table for us, so all so inclined go over to the admin thread and do the same.
Seiko, of all watches🧐 finally got a standalone forum.🤨
By the way, have we all seen the 1928 Hamilton catalogue that @gatorcpa shared? There was some talk here a few pages ago about traffic specials, and it’s interesting to see them priced at half what a 992 would cost.
https://drive.google.com/file/d/1zb3KLThw_F1H2c_WajgOllAi7m7Ksi3a/view
Nothing says there can't be multiple threads. Most of the people on this one would make them function. Would you want to go to one thread like this, or individual threads?
What would be the groups? A general discussion? Railroad, military, Non-American, by brand?
I'm agnostic about sub- forums. I do search this often and have barely scratched the surface. It would be helpful if it was sorted, but it's also nice to find new posts that bring new territory.
Regardless, for me, Canuck's PW thread is one of the crown jewels of the forum.