re: Any ideas if this is a valid Stamp?
It does look to be Sc #165, first issued in 1934. It should perf 11.5x12.5. There is a similar stamp issued in 1939, which perfs 12.5x12.
I think your postmark rules out a stamp issued in 1939.
Scott notes that both series have water-soluble ink which could disappear with soaking.
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