A few days ago while at a practice facility I came across an old British size Titleist ball that was X-OUT. The stamping on the seam read PROFESSIONAL^90. I believe the PROFESSIONAL model was produced in the early 1990s . The ruling from the USGA and R&A regarding a standard size was made almost 10 years prior. My question is somewhat two fold: Were some companies still producing this size after the ruling? Why a model such as Titleist Professional be produced long after the ruling?
One other point. As a retired military I played golf for years in Europe. A number of Pro-Shops were still selling the British size mainly to get them off inventory. I have in my possion a sleeve (still in the box) of Titleist 100 British size (1.62) with the stamping Acushnet 100 U.S.A on the seam.