Nokta FoRs Gold, a Gold Cube, 2 Keene Sluices and Lord only knows how many pans....not to mention a load of other gear my wife still doesn't know about!
looks pretty heavy, thick
agree with the hinge idea
BUT look at the hinge holes - not very circular for a pin
for an item this bulky and small pin holes is a challenge to ID IMO
Keep in mind, utilitarian stuff from bygone eras looks very decorative to us today, check out machines from the victorian era, they even cast flowers and so forth onto them and added elaborate pin striping!
Was most likely a "return" hinge
it would of had a double taper spring
attached to the pin with a spring stop
at the wide notch that has that small
nick. Right side of the coin pic.