IV-S or IV-Sb?

[dbm]

Anyone's eyes better than mine? I don't see an X on the low shutter dial, so my best guess is that this is a IV-S, and not a IV-Sb

http://cgi.ebay.com/Canon-rangefind...675336272?pt=Film_Cameras&hash=item19c4c39c50

 

[Mablo]

Could be one or another, hard to say but IV-Sb would have a small knob above the slow speed dial. Serial number hints it's a IV-F which is more or less the same as IV-S according to Dechert's book. That rapid winder is really nice!

 

[dbm]

That was my thought - The IV-F model line got renamed to IV-S (Due to the 4-F military classification). I didn't see the lock at the top, nor an X on the dial. And the high speed shutter dial looks like it goes to 1000, so IV-F/IV-S it is.