Either a MK III or a MK V. If it's in good condition thats an excellent price. And as noted above the design is extremely strong. All of the "Mark" guns I've ever fired were very accurate as well. I have a Metropolitan MK III that routinely outshoots MUCH fancier guns.
Mark Lane to William Buckley: "Have you ever referred to Jessee Jackson as an ignoramus?"
Buckley: "If I didn't, I should have"