unchromed, front fender harley lights. Made of brass. I'd like to find out what era, and bike model these might be from?

sure there of a harley and not a boat

I was thinking boat too.

Though some of these are close:

www.resurrectioncycle.com/antiquefrontends.html

No idea what they are from, but they look like they have a flat base, which might preclude them from fitting a curved front fender...

Indian motorcycles had similar, brass lights (1940ish models?) - maybe you could go check them out.

like Colstah said flat base , boat ? rubber type gasket looks like sealing , again boat . what about the wire/s . would 1 wire mean the base would be earth ?