These crank cases and engine were listed on ebay recently,the lower one looks like its been altered,might be a post war stamping or even an army workshop re-stamp?

- The first one is clear, contract number C/6128 under the engine number.
- On the second picture, the contract number (C/7162) has been removed.
- The third picture is an interesting one. We know of a Triumph 5SW with similar markings on engine and frame:



And here's a 1939 Ariel with similar numbers:



The history of the Ariel is largely known. The numbers on frame and engine are genuine and original, but the XWD stamp has been added:

email (option): wd.register@gmail.com