I don't know anything about LF gear, but this lens came to my hands and looks very unnusual to a 35 mm / MF user.
Inscriptions : SOM BERTHIOT PARIS 1114862 FLOR 1:4,5 F=165
Manual diaphragm, from 4,5 to 32; no shutter, no focusing
Photos here
http://s627.photobucket.com/albums/t...%20Flor%20165/

My search atempts disclosed two lenses for sale with the same references, but they look different from mine.
Is this a LF lens ? Has this model some variants - or are there parts missing in my lens ? Or could it be other kind of lens (enlarger, cine ??)...
Thank you in advance
Joao