The new HD are by all accounts better. Out of all the HD binoculars I sell , I get more possitive feedback on that particular HD binocular compared to the prior 2 versions of the non HD 15x56 - older light green and the NEU's
If you want to know the current market for your 15x56, you can call or...
Brian,
Call Jaret Owens - He is the tripod glassing KING !
40+ years of guiding in Alaska, Swarovski dealer etc.
AND super good guy - Owner of Alaska Guide Creations.
Cell # 805-551-6815
Good Luck !