3" X 3 5/8" (74mm X 89mm)

(Front skirt inkstamp) W.E. INSULATOR LTD.

                                VITRIFIED

                               NEW ZEALAND

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Picture courtesy Bob Berry

3" 1/8 X 3 5/8" (77mm X 90mm)

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No markings

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Picture courtesy Teresa Dempsey

3" 1/8 X 3 3/4" (78mm X 95mm)

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No markings

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Picture courtesy Teresa Dempsey

3" X 3 7/8" (76mm X 98mm)

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No markings

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Picture courtesy Teresa Dempsey

3" X 3 5/8" (74mm X 89mm)

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(skirt - inkstamp) NGK / 1962 / MADE IN JAPAN

{NGK Porcelain}

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Picture courtesy Bob Berry

3" X 3 5/8" (74mm X 89mm)

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No markings

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Picture courtesy Bob Scafe

3 1/4" X 3 5/8" (80mm X 89mm)

(skirt ink stamp)     

                              MADE IN JAPAN

{Maker unknown}

Picture courtesy Bob Scafe

3" X 3 5/8" (74mm X 89mm)

(skirt ink stamp)   

                              MADE IN JAPAN

{NGK Porcelain}

Picture courtesy Bob Scafe