Two Vintage Dunlop Golf Balls - Dunlop 65 and Dunlop Tuf Fli. The Dunlop 65 diameter is 1.62", which was known as the "small British" ball. (Note: In 1990 the minimum ball size was established as 1.68") The difference in size between these two balls, though very slight, can actually be seen if they are viewed side by side. It is also more easily seen by putting a ruler across the top of the two balls. I measured the diameters with a caliper. Note - I am a long time individual seller on Ebay. Account was hacked and had to be deleted, thus I am starting out fresh again with this new account. Original account had over 1500 feedbacks at 99.8% positive.