The big difference is that the hollowpoints of those days were either (somewhat soft) lead revolver bullets (which did work, usually) and the usual FMJ semi auto pistol bullets that had a small hole in the tip. They MIGHT work, sometimes...
I can remember 1960s era factory .25 acp hollowpoints, though I no longer remember who made them. and no, the didn't expand...
then Super Vel came along, and the world of semi auto JHPs started to change...for the better!
I am a little curious about the markings, on your Mk II, anything to indicate where it might have served. It might have served in almost any military or police organization any where in the British Empire, at one time. British officers often bought their pistols, and may "military" pistols entered the civilian market when their owners no longer had need of them.
I'm no expert in British markings, but there are those here who are better informed than I am. I do know that there are certain marks that should be on the gun if it was officially released for sale, and other marks that might tell some history. And sometimes, a single stamped marking makes the difference to a collector, between a $200 gun and a $2000 gun, (with a Luger, it can be the difference between a $2000 gun and a $20,000 gun!)and if you hit the jackpot, even chromed, your gun might be more valuable. Not likely, of course, but until you've researched the markings, you can't rule it out.
If you want to gun to look like it did when new, and price doesn't matter, call Turnbull, they do the best work in the country these days, but expect to pay a lot more than just getting it buffed and re-chromed by Platings-R-Us.