"4x5 Bausch & Lomb-Zeiss Tessar Series 1c. Pat. Feb 25, 1903" is what my lens says. What that means is it's approximately 130mm At least by my estimate at measuring.




a "willysmb" on graflex.org said
"The B&L Tessar Ic was one lens poposed in the original configuration. but in Barrel (I have a Press 5x7 with the same configuration 5x8 lens + ACME)
Since the ACME adaptation come later "

So maybe that'll help a bit. I guess they weren't too keen on confusing people with focal lengths in press cams back then, since they were suppose to be more or less point & shoot with a little distance range on the baseboard.