The R&A website would suggest it's not perhaps quite as clear cut as that - certainly at 'non elite' level at least.
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What if my ball is not listed?
It may not have been submitted, but may still conform for use at non-elite level.
It may have been ruled non-conforming
It may have expired...
Hi Elrow, I would recommend having a look at Graeme Bell at East Kilbride GC to see what you think. From their Youtube channel would appear was recently voted custom fit specialist of the year in a recent UK awards competition.
Our custom fitting process - the Golf Performance Lab East Kilbride...