According to Jeff Clew in 1927 the frame numbers ran from 9656 to 10096, then started again and ran to 601. That would suggest 441 plus 601 = 1042 frames, but of course it is likely a little less as some will have been test only, scrapped etc.
The VMCC in the UK hold all the records if you want definitive numbers. http://www.vmcc.net
Cheers,
Richard
