N-TBD: United States (USA)

3 5/8" X 4 1/8" (92mm X 105mm)

 

(around pinhole)                                     

             A.& J.M. ANDERSON ÆTNA BOSTON MASS.

 

Picture courtesy Rick Soller

3 1/2" X 4" (90mm X 102mm)

 

 

(around pinhole) W.E.CO. // W.E.CO.

 

 

Picture courtesy Matt Grayson

3 5/8" X 4 1/8" (92mm X 105mm)

 

 

No markings

 

 

Picture courtesy Rick Soller

3 3/4" X 4" (95mm X 102mm)

 

No markings

 

Picture courtesy Rick Soller

3 3/4" X 4" (95mm X 102mm)

 

No markings

 

Picture courtesy Rick Soller

  

This insulator has no inner skirt.

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