U-1103: Japan

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

 This has no inner skirt.  U number assignment from Worldwide Porcelain Insulators 1996 Supplement by Marilyn Albers & Jack Tod.


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