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1966 or older. Try cleaning up the cast flat raised area to the left in the first pic.
Ok Havi, I have a small tag with 4E5 stamped on it that is screwed onto the casting. On the casting itself I have the following things, an 'F', 'DIF' and '25' in different places on the left front of the 3rd member. Is the 4E5 the date code?