King Bee marker lights

I was thinking about putting some marker lights like these on a teardrop trailer that I'm building. I believe they are King Bee Hy-Power No. 52 lights. I'm going for a late 30's early 40's look and I'm one of those people who gets nit-picky about things being correct to the era. Has anyone seen these lights on anything before or have a catalog from back in the day with these? Thanks

 

Commonly used as upper marker lights on semi-trailers such as Fruehauf, '30s - '40s era.

 

Awesome. I knew someone here would know. Thanks for the info