Need help IDing...old blinker?

[66Fairlane]

Went MD'ing around the shell of what used to be an 1850ish schoolhouse. Didn't find anything of note with the MD but did find this in what looked like a family dump...any ideas? There is a bulb on each side under the arrows (inside the casing).

 

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[MrSchulz]

 

[normalizer]

I think you are holding it upside down.

 

[Chug And Red]

Your bad!!! Chug

 

[normalizer]

That's better. It was driving my OCD nuts.

 

[normalizer]

It's not still blinking, so we know its not from a Buick.

 

[Ia.FurTrade]

Aftermarket turn signal for a '20's vehicle.

 

[66Fairlane]

Aftermarket turn signal for a '20's vehicle.

Any ideas on the manufacturer? I have been searching online and cannot find one that looks like it. Other than being from the 20's, is it rare? Any help would be greatly appreciated.