CD 251:

Hemingray-61 in blue aqua

New England Glass Manufacturing Co. in Green

New England Glass Manufacturing Co. in light aqua

Lynchburg Glass Co. in milky aqua

Hemingray No. 61 in Hemingray Blue

New England Glass Manufacturing Co. in aqua

 

This is a standard low voltage cable insulator, and was made by several glass houses.  

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