New to this site... go by 'hombrec' ... am a LF photographer, currently buy/sell online FT... collect and use lots of different vintage photo gear... often buy from similar folks.. recently bought a "lot" [lots of items] from a serious former photo store owner/collector/camera repair person [he was multi talented, even claimed to own the copyright on some obscure camera listed in McKeowns]... but to make this short now.. have what I believe is a
70mm Film Back for a Keith Camera?? I recall asking this guy what this back would fit, and think he said a lot of cameras have this same type back... ?

I am hoping someone can help identify what it is , what it fits and approximately what its value range is, given
todays market... I already know I can just throw it on ebay and pray... but prefer to have more information before I resort to the "Hail Mary" approach...

... attached are some pictures, interesting, there is FILM still in the capsule, I did NOT open it up, nor do I know how to [yet] ... figured it might add to the mystery of this item, for someone who can actually use it...

thanks in advance...