Here's what we know about this device. It's nickel-plated. It was worn on the base of the penis in order to deter arousal. And a quick google search reveals that it went by a fairly disturbing name (that link also gives you a better look at how truly horrifying this thing must have been to wear...sorry late 19th/early 20th century guys).
However, we appreciate the restraint this museum display card shows. Just because most of these devices were British, it doesn't mean these exact three were as well.
No, they're only "probably British."