I worked on the Federal Building installation as a 50% helper. It was my first job in the field after leaving Haughton engineering on Glendale Boulevard. Also worked your 6300 Wilshire job. I believe it was Beneficial Standard. 1888 & 11901 Ave of the Stars as well. You are right about the B5 Vernier. Haughton only shipped three of these. 6300 Wilshire, 1st National Bank in San Diego (worked that one too) and a job in the Mid West. My Dad Vance Collett adjusted all the LA & San Diego jobs. When you had FOB who were you working for.
If you're still wrenching it, work safe,
Jim
PS: Not a pitch here, I talked about most of the above in my book "Elevator Man Stories"
