I was surprised to find this example (which arrived today) complete with original tin, wind shield, spanner, pack of prickers and spirit bottle. The original instruction leaflet was also included. Judging by the hard plastic spirit bottle I think it dates from the 1950s. I think it has had little use but the tin has suffered from being stored. The base is stamped B 6. Could this be a date reference? After a day spent cleaning and servicing it works fine.