History Any help on identifying vintage light

Looking to see if someone can help me identify what this is. it's some type of taillight accessory not sure what it was off of. The light part does swivel back-and-forth. Any help is appreciated

 

Here is Another picture

 

It is a WIG- WAG taillight you can always find one on the auction sight.

Bill

 

Looks like a light for an emergency vehicle.

4TTRUK

 

X2on wig wag. Used to bring good money.

 

Correct. HRP

 

The wig-wag light was a popular aftermarket accessory in late '20's/early '30s. Not specific to any particular vehicle, looks cool on anything of that vintage.