Good catch Dick. The 682 24th Ave. address must have been an early  S.F. location for the Pacific Gun  Sight Co.

All other materials, I have seen, give the Company's address as 355 Hayes Street, San Francisco, Calif.

Nick Stroebel, "Old Gunsights & Rifle Scopes", stated: "The Pacific Gunsight Company, 355 Hayes Street, San Francisco, California, was started in the late 1920s to produce a quality line of reloading tools as well as gun-sights".

Stoebel reports the 1953 edition of the "Gun Digest" as the last mention of the Pacific Co. manufacturing gun-sights. Reloading tools were manufactured until the company's 1991 closure.

The Pacific sight 'literature' often mentions a 1931 patent date.

Pacific sights also were eventually packaged in a distinctive box.
(Due to postal labels, I can't tell if that is the case with the sight I showed at the start of this thread).

(Attached catalog pages from 1934):

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