I have a 200 'mph' speedo but I don't think it's certified. I know it's actually a metric speedo but it doesn't have units on it, so it's a 200 mph speedo now.
Yup, that's the export speedometer. Here's a pic of the NOS one I sold on here some years ago—part numbers up at the top might enable you to find another. All it takes is an appropriate speedo drive pinion and it'll indicate MPH.