Jim I bought one last year off of Craigslist, same case with the showdown face that was upgraded to the 5.6 already. The buttons on the side of the mount say AV so not sure if it was pre marcum but it works great. I bought it as a loaner/backup. I sent it to marcum for a check up and disclosed it was used so let me know if anything needed repair to charge me but they fixed something and said no charge, great service! So I bought an lx5 right after that! I used it on Otsego last year my first time ever going there and it worked great in the 160' area, you're welcome to try it if you'd like, its always with me in the sled for anyone who doesn't have electronics .