2 3/4" X 4" (68mm X 98mm)

(side recess embossed)

{Maker unknown}

Picture courtesy Bob Berry

2 3/4" X 3 3/4" (68mm X 95mm)

(side recess embossed)

{Maker unknown}

Picture courtesy Bob Berry

2 1/2" X 3 3/4" (61mm X 92mm)

No markings

{found in Viet Nam}

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Picture courtesy Bob Berry