Projects Car mirror Id

Sitting at Home In California and Seeing if anybody Could Help.Picked up this Car Mirror the Other Day on Ebay, it just came today, Thought i knew what make it came from, but even i'm Stumped?

 

I usually cheat by looking for a part number cast into the bottom of the mirror, on the mounting area. The format of the number often hints at what make it is, and possibly what year. For example, if it says C1AB I'd guess it's from a 1961 Ford.

 

Sorry i thought i Posted that, Two rows of numbers. First Row, M1421 followed by a N in a Circle, and Second Row with 3750725

 

'58 Chevy Impala accessory mirrors, I think.

 

1958 Chevrolet Accessory Mirror Bel Air Biscayne GM #3750725

 

that looks like the ones that were on ebay, eh?

 

Yep, google is my friend