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Hi all
I am in the process of restoring a Zerda and had to order the longer belt for the optional 18 tooth pinion/pulley , it's the 93 tooth belt but I could only get them in a pack of 10 so I'm going to have way more than I need , they only cost me a little over $11 so no great expense , any body want or need one just for the price of the delivery ?

You ever figure out what the pitch is?

Yes it's an imperial MXL pitch , it's about 2.03mm and 0.25 inch wide .
The one fitted to mine when it arrived is a 91 tooth belt but I suspect that's smaller than it should be ,even with the 15 tooth pinion pulley that was the smallest one supplied with the kit it's too tight , I'd guess the stock belt should be a 92 tooth belt and that would be used with the 15 and 16 tooth pinion pulley and the 93 tooth belt is for the 18 tooth pinion pulley that was an upgrade option , I tried a 94 tooth belt with the 18 tooth pulley and it was too slack even with the tensioner at max .

Good to know the pitch. Thanks for the info.