I thought that prior to December 1925, the only number on a Model T was on the engine block, but I have now been told that cars up to about 8,000,000 (wooden firewall) often or usually also had a serial number on the firewall.
Can anyone tell me if this is correct please?
I cannot find a mention of it in McCalley.
Without looking it up, I don't think the plates were numbered by 1,000,000. the plate number did not match the engine number except in the most earliest production. Check the T encyclopedia on this site, I believe this is covered there.
While what David said may be true for US production cars, the ones built in Canada or over seas my be different.
Good point, I didn't notice his location, My Bad!!
I believe 1915 is the final year for car numbers on the patent plate. In 1916, they still had the brass serial number plate, but there were no numbers on it.