“Friend received this passed down from his great great grandfather. It’s believed to be from Persia & about 2,000 years old.”
"It’s a hairpin or a clothespin/brooch. If it’s something 2000 years old, you need to see a professional at a museum/institute of archaeology to get it evaluated and then get it insured."
...film container. No mine has this particular imprint on the housing. For pressure you install AP or frog type device under, and pressurize with AT.
They are used all over to prevent damage to ships in general.
We use yokohama fenders while repairing the regular fenders on the jetty.