3 1/2" X 5 3/8" (86mm X 132mm)

(ear top inkstamp)

{FIL}

Picture courtesy Bob Berry

3 3/8" X 5 1/4" (83mm X 129mm)

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No markings 

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Picture courtesy Bob Scafe

3 1/2" X 5 3/8" (86mm X 132mm)

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No markings 

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Picture courtesy Bob Scafe