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The WD Motorcycle forum
It certainly looks correct - 90 mph non-illuminted, non-trip with Jaeger drive. Is the bezel dull chrome ? That would pretty much confirm WD origins. It is missing the data plate.
Not just for an M20. Several early WD makes would have used that Jaeger pattern. I just had a non working speedo overhauled for my 1940 Triumph 5SW.
email (option): ronpier@talk21.com