Henk, it does look like Triumph, evidently for capped fork ends. It looks similar to my T140 front spindle, but the packaging suggests maybe late 60s, early 70s (just a guess). I'd guess at late T120 Bonnie. However, it looks like there's an O-ring on one end, which doesn't make any sense to me. Trident? Rocket Three?
It would help if you posted the length of the spindle.
It looks like Triumph OIF from the 70s conical hub front, have the same in my 650 72 tiger. I am not sure, if i have a thread on one side. greetings jarek
The Navy had T140s and so did the Royal Signals..so it could be a comical hub part as Jarek stated..What about the Dutch Army unit construction 500s?...Ian