Red is correct. It's an "anti-masturbation" device. "The rare 19th century item is made of copper and was designed to be worn by boys so they could not commit the 'sin'. Attached to a belt it would have encased the genitalia. The bizarre antique dates back to around 1880 and was used in Catholic France." I just have one question. Did people back then not get morning wood?
See, I thought it was one of those devices Brazilian amazon Indians wore in the rivers where the dreaded Candiru lives. It's a parasitic catfish that normally lives on the gills of other fish. They're attracted to ammonia and urea, which are excreted by the gills of fish. When you swim or bathe in the river, the small juveniles can swim up your weenie, and then erect those catfish spines to lock in your urethra....ouch !! They have to be surgically removed. Here's an x-ray of some unfortunate man.
It almost looks like something you'd use to cut stump roots so you could pull the stumps out easier or for cutting squares of sod to make an old sod house.
It's an ancient amazon surgical tool used in removing the catfish that just swam up your ding-a-ling.