Bill
32126
There are at least three early versions
I think it is safe to say mid 60's with the early sea dwellers at least for the 9315.
Below is a very early example and highly coveted "PAT PEND". This one is stamped 1 70.
9315 with 280 end links. 
The next model here is the "PATENTED"
Also 9315
The third model has "PATETED" stamped not sure why the N is missing. I need to grab one and take a picture.
Best
Bill
Flip-lock bracelet clasp - introduced??
Hello, I'd like to pick your collective brains if I may and ask when the Flip-Lock bracelet clasp was first introduced? I've seen quite a few 'folded' bracelets with flip lock clasps and I assume these were later replacements. Was the flip-lock introduced...
First Flip-Lock
I believe this would be the 9290/8 and then 9315........introduced first on a Sub and then Sea-Dweller. So, hard to be totally specific to a single year, but definitely late-1960s for the 9315 and a bit earlier for the 9290/8.....mid-60s?
Thanks
I did'nt realise it was that early - very interesting. Do the earlier versions have any distinguishing features? It's good to keep learning!! Thanks again. Vernon
There are at least three early versions
I think it is safe to say mid 60\'s with the early sea dwellers at least for the 9315. Below is a very early example and highly coveted "PAT PEND". This one is stamped 1 70. 9315 with 280 end links. The next model here is the "PATENTED" Also 9315 The thir...
Thank you....
Bill, It seems the bracelets are just as interesting and have as many variations as the watches! This is great stuff. Regards, Vernon.
Now we have the three variations
It is strange this misspelled version. It is also common to find. Thanks Bill
Found some images
Courtesy Rolexforums This was the first and only on the double pink 1665 This was followed by the 9315 folded 280 end link possibly also 1967 ...
Thanks...
Thats a very interesting variation. Hopefully all this knowledge will help to make sure that I get the correct bracelet in future. Best wishes, Vernon