Unusual rear veiw mirror

My wife bought me a car part at a local estate sale that I need advice on. It's made from 2 mirror sections side-by-side. One tinted (for night use?) the other plain. Both are rectagular, about 3 X 4 in. and have beveled edges. Both articulate separatly on ball sockets. Is this an after market? From a particular make? What era? Seems old, much like the one in my 170S.

These were, I believe, standard equipment on Pierce Arrow and possibly some other makes of the late '20s and maybe early '30s. They were no doubt also available as an aftermarket item.<P>The glass size on the Pierce mirrors was <BR>2 1/2" x 4". At one time I manufactured replacement glass for these mirrors. The clear was easy, but the light absorbing one was a bit more complicated.<P>hvs