As Jim in Idaho pointed out, ALL left hand Model 70s were New Haven made. The fact it's a left hand Model 70 makes it more valuable. Winchester made two different left hand .375s, the Safari Express that you have and the earlier produced Super Express. The differences in the Super were a slight Monte Carlo comb stock, two piece TG/floorplate and a polished blue barrel with a sweated on front sling stud. The Safari Express's seem to bring more money.
