Pinkham & Smith S A Doublet Special Lens

[antiqueguy]

Hi, I am new to vintage camera items and wondered if someone could share knowledge of this camera lens that I have? The barrel is marked P & S S-A-Doublet-Special. Thank you

 

[gandolfi]

Item number: 150595770350

you got that? (If you don't know what you've got, then sell it to me...)

the experts are on large format forum...

 

[antiqueguy]

wondering what the "special" means?