Titleist 910d2 where is the serial number located?

[mouldy33]

hi I have just bought a second hand titleist 910d2 it has an upgraded shaft (the original shaft had a serial number but there is nothing on the head ?? help

 

[fundy]

On my D3 the serial number is on the back of the hosel because it was a custom fit head (just behind where you use the wrench to adjust). I do believe the stock heads didnt have serial numbers on the heads just the hologrammed sticker on the shaft