Mizuno STZ 220

Joined
Nov 12, 2022
HCP
20
Local club/country
Åland
Irons
Mizuno JPX 919 5-PW
Driver
Mizuno Stz 220 10.5 Ascent 50R
#1
I recently bought a Mizuno STZ 220 driver and I like it very much!

Does anyone know why some Stz 220 drivers have a Serial number stomped below the loft adjustment screw, And some drivers doesent have! Mine have not, Very thankful for answears!
 
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