1 7/8" X 2 1/2" (48mm X 64mm)

(front skirt inkstamp)

{Shofu}

Picture courtesy Jim Van Norstrand

2" X 2 1/2" (50mm X 64mm)

(front skirt inkstamp)

{Maker unknown}

Picture courtesy Bob Berry

2" X 2 1/2" (50mm X 64mm)

(front skirt inkstamp)

{Maker unknown}

Picture courtesy Bob Berry