I've been going through my storage room trying to get all my photography stuff organized and I came across a rather large (5-1/4" long and 3-3/4" across) lens marked
McIntosh Stereoopticon Co.
Chicago
H-15
It looks to have a focal length around 12"
Any idea what type of lens it could be?
Perhaps a Pretzel?
Does anyone here have one of these?
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