1. Identifying by differences in the shape of the markings
Fake clubs often have different fonts and sizes of engravings compared to genuine products. The engravings on the fake club are roughly made, but this pattern is common. In some cases it is difficult to tell the difference without comparing it to the genuine product, so be careful.
2. Identifying heads made of carbon material
It's hard to tell from the photo, but if you look closely you can see it.
Some fake clubs are not made of carbon material but just printed.
3. Identifying counterfeit products using anti-counterfeit labels or serial numbers
4. Checking appropriate swing weight and shaft flex(CPM)