U-2273: Portugal

2 1/4" X 2 1/2" (57mm X 64mm)

 

(crown inkstamp)

{Electro Ceramica}

 

 

Picture courtesy Bob Berry

2 1/4" X 2 1/2" (55mm X 61mm)

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No markings

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Picture courtesy Bob Berry

2 1/4" X 2 1/2" (57mm X 64mm)

 

(crown inkstamp)

{Electro Ceramica}

 

 

Picture courtesy Bob Berry

U number assignment from Worldwide Porcelain Insulators 1986 Supplement by Marilyn Albers & Jack Tod.

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