I've had this for a while and cannot find any information on it. It's 6" in diameter and heavy cobalt glass. Someone said they thought it was used for map reading in low light. Don't know if that is true. Has a small chip in 1 piece of glass and a hole in the case.
I am not an expert on these so Please inspect all pictures before bidding. Condition: This is USED/PREWORN/VINTAGE. Has not been laundered by me. Bought to resell. Being sold "as is" with NO RETURNS & NO REFUNDS for any reason. No partial refunds. And the shipping is what the post offices charges. Thank you for shopping!!