I know nothing about hi-powers, because I don't like how they look at all, so I've never had an ounce of interest, but man does that look like a tiny extractor! Are they all like that? Looks insufficient as he!!, like a 22lr.
If it's truly a Browning, as opposed to some Korean or Israeli or etc remake, then it's gotta be worth some mullah! That name usually carries with it a ton of weight within the firearm community.
Do you know what the "T" series serial number indicates? I assume you mentioned it specifically for a reason...
There's some moderator or old crony on here that idolizes the things whom might be able to provide you with some interesting and helpful info. I'm just here out of an akin curiosity.