There are two versions of this great little Shinwa 6" ruler - the No. 3001 A, and the No. 3001 AE.
The only difference seems to be that the AE model has has tick marks on the ruler ends of the side containing 1/16" and 1/8" scales. This added functionality can be useful in certain situations. (The side with the 1/32" and 1/64" scales is almost identical on both models.)
The No. 3001 A seems to be available at a number of outlets. I think I got the No. 3001 AE from Lee Valley.
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