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Nope he isn't Motion Pictures Weekly was never published or released and even if it was Namor would 1 month younger than batman.

Motion Picture Funnies Weekly wasn't actually published though. and even then it still wouldn't make namor older than batman. because batman's first ever comic was released in March 1939. and that...

batman appeared in march 1939 and namor in october 1939. even when looking at Motion Picture Funnies Weekly which was unpublished batman is still one month older.unpublished art/comics don't count.