Can anyone identify these mirrors?

I am helping go through the estate of a friend of mine and ran across these mirrors. I suspect they might be for a boat, but figured I would ask if anyone know of a car these might have been on? Sure are cool looking.

 

I don't recall ever seeing a automotive mirror that had 2 mounts at the bottom.

I'm just guessing here but probably be a designed for a boat. HRP

 

Looks like Yankee aftermarket like this on eBay

http://www.ebay.com/itm/YANKEE-4012...Parts_Accessories&hash=item460ceb0d12&vxp=mtr

Apparently sold by J.C. Whitney in '59

http://www.ebay.com/itm/1940s-1950s...D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557

 

Had some like that on a 60 Chevy Biscayne that had acouple of years ago. Had no other mirror holes on the car, original paint. Just those on the front fenders.

 

I remember seeing a set out on the fenders of a big GM car, when I was a kid. Can't rightly remember the model, but late 50's or early 60's.

 

car fender mounted mirrors not factory aftermarket,, mostly in the 50s