FWIW - The last entry I could find for the Pacific Gun Sight Company in the San Francisco Polk Directory was 1948-1949. The Company was listed at 355 Hayes Street and 1418 Polk.

The 1948-1949 Directory is also the last listing I found for Robert J. Miller and Robert S. Miller having residences in S.F.

It is possible the Company moved and relocated around this time.

San Francisco Sanborn Maps indicate the building at 355 Hayes Street was built in 1924 and is still standing. (Much modified, I suspect).

I have yet to find photographs or much historical detail on this seemingly obscure company.

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