SPENCER LENS CO. MICROSCOPE OBJECTIVE, American (Buffalo, N.Y.), , mid-20th century, 95x, N.A.1.25, Hom. 1-1.8 mm, # 574493. Very fine.
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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 protected]