I got a lot of holders a while back and in the group were 2 wooden holders in very good condition,..but they had no bottom hinge. Film slips in fine up to a point. There is about 1/8" that won't go in. Looks just as if you tried to load a "regular" holder with the hinge closed. The only mark on the holder is a stamp..."PLATE R.O.C. 8x10" Fiber dark slides with wooden tops. Anyone know what I have?