Some early norinco imports were actually ex-type54's military guns, and theu do command a premium. You can identify those with the date on the frame. Then they transitioned to these with "no date". Then the last ones imported had forward facing slide serrations. I believe those to be the least quality made ones. Early ones, obviously the best.
At about $700 two people then ran up the price, but even up to $700 blows my mind.