1983 – Apodaca Bros.

3878 Howe Street

I’ve decided that this must be 1983, but I’ve been puzzling over it for more than a year.

1988 – C. Valenzuela Con

5922 Chabot Crest

1987

192 Ridgeway Avenue

This address has two circular patches with this mark, not really a stamp. If 1980s marks weren’t so scarce, I’d disqualify it.