I have something similar connecting the webbing back-straps that take the place of the lifelines in the cockpit area of my boat. See pic below,My guess is that it's for attaching several turns of line to the end of a strap, so as to lash the strap down, perhaps over an upturned dinghy. One end of the line is passed through the round hole, with a knot in the end, and two other turns are hooked over the arms before tying off. The strap of course is sewn through the slot.
Belt buckle?
fuel/water filler cap key ?
Shackle key, or a very small anchor.
A boom brake or a climbing descender (used when going up the mast)?
An amulet for followers of the cult of the Monkey King?
My guess is that it's for attaching several turns of line to the end of a strap, so as to lash the strap down, perhaps over an upturned dinghy. One end of the line is passed through the round hole, with a knot in the end, and two other turns are hooked over the arms before tying off. The strap of course is sewn through the slot.
The short lanyard in the picture is irrelevant to this use and has been added later.
I have something similar connecting the webbing back-straps that take the place of the lifelines in the cockpit area of my boat. See pic below,
didn't consider that. a guess or have you come across something similiar previous?
fuel/water filler cap key ?
An educated guess at best. It's not too dissimilar to this http://www.aliexpress.com/store/pro...pel-devices-Eight-Rings/702512_729095704.html.
But it is difficult to tell from your photo what it is made from.
Looks very much like bronze or gunmetal to me, classic old yacht stuff.