Every large camera company offered its version of the straight barrel single achromat. Blair probably purchased theirs from Darlot or an equivalent optical company, then engraved their designations on the barrel.
References:
Illustrated Catalogue and Price List of
Photographic Apparatus and Supplies, Section A, Blair Camera Co.
(Boston, MA), 1893, p.
18
Illustrated Catalogue and Price List of the Hawkeye and All Styles
of Tripod Cameras and Accessories, Blair Camera Co. (Boston, MA),
1896, p. 22
Catalogue of
Photographic Apparatus and Supplies, Blair Camera Co. (Boston, MA),
1897, p. 30
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