https://www.titleist.com/teamtitleist/team-titleist/f/the-clubhouse/16576/910-d2-head-serial-numbers Should the 910 D2 Head serial numbers have 5 or 7 digits? I picked up one today used and it only has 5 digits etched in the head where as my 3 wood and hybrid have 7 digits etched in the head. I bought the shaft and head separate so know they won&amp;#39;t matchen-USTelligent Community 10https://www.titleist.com/teamtitleist/thread/74688?ContentTypeID=1Tue, 24 Apr 2012 15:35:39 GMT9ab519fc-5311-4952-85cd-0a0ceffb73fb:9670ab82-1595-4ad2-bd05-f7320212d581Cath D.<p>It can have either depending on whether it was built through stock or custom.</p><div style="clear:both;"></div>