Here is some information from my database on 60-A, -B, and -C production that I recently put in another post:
The earliest A in my database is 190-22, with a firewall date of 5/10/1928. The latest A in my database has a firewall date of 12/8/1928 and a frame/engine number dating to 12/11/28. Unfortunately, the Briggs tag was missing on this car, but another late 60-A with a firewall date of 11/16/28 has a Briggs body number of 190-68853.
The earliest 60-B in my database is 190-99775 with a firewall date of 1/4/1929 (it's possible this could actually be a 60-A). The latest 60-B I have on record is 190-151957 with a firewall date of 4/8/1929.
The earliest 60-C in my database is 195-812 with a firewall date of 2/12/1929. The latest 60-C in my database is 195-17608 with a firewall date of 7/17/1929. This shows that production of the 60-B and 60-C did overlap.
Along the way, I have also stumbled upon a few 170-A's. These cars used a prefix of "197". The earliest car has a firewall date of 8/7/29 (no other numbers) and the latest has a Briggs body number of 197-6337 with a frame/engine number dating to 10/10/1929. It seems less likely that production of the 60-C and 170-A overlapped.
My e-mail address is
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Regards,
Russ