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19.5 ring size is
If the ring is 2 cm in diameter, the US ring size is 10 and a quarter. In terms of British and Australian size, it is said to be U.
The diameter of a size 9 ring is approximately 19.0 millimeters (or about 0.75 inches). Ring sizes can vary slightly by manufacturer, but this measurement is generally accepted for a U.S. size 9. It's important to consider that the fit may also depend on the design and width of the ring.
"Ring" refers to the diameter of the cigar. It's in 1/64ths of an inch, so a 32 Ring cigar is 32/64" in diameter, or one-half inch. A 48 Ring cigar is 3/4" in diameter, and so on. Apparently there's a ring gauge you can get to measure cigars; it would have holes in it in various sizes, and whichever hole the cigar fits snugly into is the cigar's ring size. You could also use a ruler, calipers, just whatever you wanted.You might see a cigar specified as 6-1/2" x 42 ring. This cigar would be six and a half inches long by 42/64"in diameter. (The name for this size is Lonsdale.)Box-pressed cigars also have ring sizes, although those cigars are square--a 48 Ring box-pressed cigar is 3/4" x 3/4".
i believe you mean US sizes Diam = 20.7 mm Circum = 64.1 mm