Ardie was founded in 1919 by Arno Dietrich, an ex-Premier technician, and they stayed in business until 1958. They enjoyed some racing success in the 20s and 30s, but this B251 was a 246cc tourer sold between 1951 and 1953.
I had never heard of Ardie before and it’s hard to find information on this specific model, but it looks like the engine produced about 10 horsepower through a 4-speed gearbox, good for a top speed of 58 miles per hour. Weight was 297 pounds.
This example was restored by the previous owner and has been started just once since the seller imported it when he was stationed in Germany (unclear when that happened). It will need a new battery and a carb clean. Find this Ardie for sale here on Craigslist for $8,000 in Cleveland, Ohio.
This bike-uriousity brought to you by David N!