Just received my new TSR2+ (from Carl's Golfland). Looking at the serial number, it's something I haven't seen before. It has the normal 7 digit number on the heel of the club (entering this number on the registration page shows the correct club) but then there's a -03 at the end of it. Just curious what this means. If I enter the 7 digit number with the -03 at the end it's not found. Not questioning the legitimacy of the club at all as it came from an authorized retailer, just wondering why the addition to the number. I own a ton of Titleist clubs and have never seen this before.