Help with Philbrook identifying mark?

[PhillB]

OK here ya go. It's no lightweight! I converted it into a proto-mountainbike ("klunker") with derailleurs in '79, but then put it back, not 100% original but close. I kept a non-original front drum brake because it's hilly here, with lots of car traffic.
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Also because of the hills, the chainwheel is smaller than stock and the rear sprocket is larger. The original was a "sweetheart", heart-shaped cutouts:
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I originally bought it for $10, they guy wanted $15 but I talked him down.

Very cool! It's amazing how much variety there was in bikes in the 1930's! Love that original chain ring too!