In the 20+ years of having these contact prints I made from the “wide screen format” NO ONE HAS EVER SEEN THIS SIZE. I have not had anyone id the possible camera, or anyone else using this size film frame ratio/size.
VERY RARE. Contact prints made in 1990s, negative marks on print 5×7 Kodak Paper. Unknown photographer.
Please note that other sellers of 1906 S.F. photos are POSTCARD PHOTOS, many many copies made.