I saw a S&W M27-5 at the Indy 1500 Gun Show this weekend. It was new in the box, unfired with papers for $550. The dealer said it was from a special run at the same time the 50 Year Comm M27 was made. The serial# is BHF39xx. When was this gun made? Is it as valuable as the older models? Is it worth $550? Thanks for the help.