This is an Antique SPENCER LENS CO. (1895 - 1945) Camera Lucida. It has the 2 3/4" x 4 1/8" Mirror that has an Arm Connected to it that Fit on the Lens Mount, the arm has a Scale of 60 - 120 millimeters. The Barrel has an Opening 1.000 that Fits to a Microscope. The Wood Case and Mirror have a No.
19 the May be a Number Assigned from the University. Thanks for Checking This and Our Other Lisings. This item is in the category "Antiques\Science & Medicine (Pre-1930)\Scientific Instruments\Microscopes & Lab Equipment".
The seller is "kamermanantiques" and is located in this country: ...