Just a thought, this might be better suited to the Yamaha sub-forum instead of the marketplace.
In the meantime, I'm gonna see what i can dig up about your actual question. I know some of the things that changed on the 62 alto over the years when they made improvements, but not the sop's specifically.
I recall the first 62's had their low C# pad on top of the tube. Later, the low C# was placed on the lower part of the tube, in line with B1 and Bb1. This was alluded to in a recent FOR SALE posting on SOTW. I've also mentioned it before.
The recent seller of a 62R commented that he thought the more recent placement of the low C# (underside of the tube in line with B1 and Bb1) was the better design.
I disagree - the placement on top of the tube keeps the low C# out of the moisture stream and thus reduces the chances of sticking shut.
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