I recently brought jpx 19s. Played with them like 2 or 3 times at the most and have rust appearing on my 7 iron. This happen 2 anyone else? Never had this before. Shocking really.
This quite frequently crops up in the forum with regards to rust spots on forged clubs. Sometimes caused by grit damage to grooves and then water being being on the face causing rust. Do you follow the "caring for your irons label"? https://golf.mizunoeurope.com/caring-for-your-forged-irons/