When all the clubs have the same serial number, it means that they were custom ordered.

When only the 6 iron has the serial number, it means they are standard production which you get off the shelf at stores.

I have had the same good fortune with used Vokey wedges. I also bought a used set of 710 MBs that all had matching serial numbers as well. What this means is that they were custom ordered from Titleist. I e-mailed Cathy with the serial numbers, from my…