One of the older guys that works here was given these almost 50 years ago by an 'old guy from the war'. I made a little web site with a few pictures (including links to high res ones) at
http://ospreynest.org/pete/. I think Pete was hoping to supplement his retirement by selling these. Although they are pretty neat (and heavy!) I told him they probably weren't worth much. Maybe if he's lucky a few hundred dollars.
I hope, for Pete's sake, I'm wrong. Does anybody know anything about these?