I believe they were only offered in 1948 and into '49 but were discontinued due to fragile construction (being encased in a plastic lens). Accessory only and I don't believe any bike carried them from the factory. So the only way to get one would be to order the (rather expensive) speedo.
I have one I'd sell as I have yet to find the perfect early postwar bike to put it on. Maybe the most uncommon postwar speedometer. It's in better condition than some, lesser condition than others. A little yellowing but very readable and it works. Trip meter doesn't reset. 60$ shipped.
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hello, did you ever sell this unit?