What grip size is a size 3 on a Prince racket?

Question

Is it 4 3/8 or 3/8 or what? I saw this that stated grip sizes were different in the prince brand:
http://tt.tennis-warehouse.com/showthread.php?t=18634
I have two size 3 rackets and want to buy a third one but I don't know which size it would be. Here are the options:
1/8, 1/4,3/8,1/2,5/8
I think it was 1/2 because I remember it was the second to the largest size but Im not sure.

Answer 1

3 is 4 3/8 -> http://www.sandiars.com/reference/racquet-grip.htm :)

Answer 2

Tennis Grip Size 3

Answer 3

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Look closely on the racquet, it will typically specify the grip size on the inside of the throat. If it isn't, try simply measuring the diameter of the grip (subtract 1/8 of an inch if he is currently using an over grip, add 1/8 of an inch if there is no over-grip and the grip is particularly worn down). Thee buttcap of a racquet has the symbol of the brand (W for Wilson, P for Prince). I believe you may be mistaking the W as a 3. If you find you cannot find the grip size using the aforementioned methods, you can always measure his hand to find his grip (see source for information on doing this).