Dummy Boys Anti-tank Rifle

I have a dummy Boys AT rifle that I bought mail order about 1965, from one
of the legion of dealers operating then. I paid maybe $15-20. It is fairly
crude, made mostly of black-painted iron, with a wooden stock, cheek rest, and grips. The barrel is solid (not bored). You can flip the "safety" back and
forth -- and work the bolt -- but that's about it. There are no discernible
markings, but, for a couple of reasons, I don't think it's just a one-off made
in someone's garage.

Otherwise, I know nothing about it, so any information would be welcome. (I
can find a fair amount of stuff on the regulation models, but nothing on this dummy.) I am currently making up an inventory of my collection for insurance
purposes, and would particularly like estimates on how much to value it.

A picture would be useful here, but if it was a genuine military training tool if would most likely have some sort of acceptance stamp at the very least.