STEREOSCOPE FOR VERASCOPE VIEWS, French, early 19th century, signed. The handheld brass stereo viewer is 4-1/2″ (11.5 cm) across, with side panels that latch into place, and slotted arms that swing down as carriers for stereo views. In fine condition, it folds flat for portability.
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David and Yola Coffeen both have enjoyed academic careers, as planetary astronomer and as linguist/educator. But since 1982 (yes, 1982!) they have been full-time dealers in early scientific and medical instruments, under the name Tesseract. Selling primarily by catalogue (over 100 issued so far) they also have a web presence at www.etesseract.com, and can be contacted at email@example.com.