Primarily Petroliana Shop Talk Forums Non-Petro Discussions Non-petro Discussion and Showcase any railroad crossing sign experts on here?

i'm going to look at a crossbuck sign for sale today with the two lights, and my question is how do i determine the age of the sign? is it dated like a pump plate on a gas pump? right now all i know about it from the seller is the lights are metal with glass lenses, and the sign itself is "heavy", whatever that's worth.
any advice here would be GREATLY appreciated!

...and if this is too far off topic, please delete.

-tred

Tred, Contact member Let er' Buck. He should be able to help you with your question.