"I found this today buried in the hard packed dirt of my horse shed today. It’s about the same size as this Artline220 pen and made of stainless steel. There are grooves cut into the side of the head maybe for an attachment or as a guide for twine?"
"It’s a scalpel handle."
...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.