U-1966B: England

4" X 4 1/4" (98mm X 104mm)

 

(top embossed) SIEMENS PATENT (in circle)

4 (in center)  

 

Picture courtesy Teresa Dempsey

4" X 4 1/2" (100mm X 115mm)

 

(base view)

 

 

Picture courtesy Teresa Dempsey

U number assignment by Bob Berry June 2019.


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