Mt. Baldy Drive-In
This sign along Arrow Highway on the north side of the Los Angeles County Fair Association’s Fairplex was restored and moved to that spot in 2008. A story in the San Gabriel Valley Tribune says that it was originally built in the early 1960s in the area of White Avenue and Foothill Boulevard as part of the old Mt. Baldy Drive-In Theatre.
Screengrab from Google Street View, which owns the copyright. Posted here for the historic Fair Use of illustrating what the Mt. Baldy’s lesser signs looked like.
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