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The gun is a 1980 Belgian version . . . the gun itself is basically in brand new condition . . . .
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They're all Belgian, even the "assembled in Portugal" ones. Also, many that aren't marked "assembled in Portugal" are also assembled in Portugal. So, really, there isn't much premium for the markings. Absent historical markings, etc., they're pretty much all the same IMO. Age has more to do with features/shootability. For a shooter, newer is probably better as the sights are a little better, safety is larger and they may feed hollow points better. I don't believe anybody makes the argument that a particular era is of higher quality or build to better manufacturing standards. They're all good. I'm sure Hi-Point collectors would quibble with this, but that's my take.
Condition is everything. You can buy a brand new blued Hi-Power for about $900, so a high condition used one should bring $600-700 or so. There's been a bunch of ragged out surplus ones on the market lately in the $400 range.
Sweet guns. I've had two or three in the past but always sold them. Recently, I decided I needed another one and started watching the surplus offerings. Found a relatively high condition MkIII and stepped up at $500. Probably high for a surplus import but it's a nice one.