Large Middle Eastern copper coin?
I have a WWI soldier's dog tag with names of battles in Turkey and Egypt. It's made from what I assume is a large copper Middle Eastern coin... worn absolutely slick with nothing of the original coin designs. It's big, though -- 37.3 mm, 21.0 grams. Most coins that big were silver. Can anyone come up with a candidate for a copper coin that big that might have been floating around the Middle East around 1916?
The closest I could find so far would be a 40 para from Turkey or Egypt. Those are 37.0 mm, so too small for this one. Since this is so heavily worn, I assume that the current 37.3 mm diameter comes from a coin that was originally a bit larger, maybe 37.5 to 38.0 mm as struck.
[To save anyone from looking the rest up, I read the punched lettering as J. W. Roberts, 17th Royal Welsh Fusiliers 2831. The Landing at Sulva Bay (part of the Gallipoli Campaign) and the Egypt Campaign were major battles in WWI. The British fought against the Ottomans with lots of other smaller powers also involved on both sides.]