As best as I can detrmine, there were less than 170 Dynacycles manufactured. Serial numbers started with 1000, the last in the registry is 1619. Check out Dynacycle.org for more information. I've owned 14, have restored 22. Limited reproduction parts are available. My motorbike adventures started in 1949 with a Whizzer, then a Marman, J&H and finally a Dynacycle from a dealer in Faribault, Minnesota. The latter is soooo much fun to ride with power and speed well beyond the other bikes made at that time.