This Jag has an unusual long track under it. It was built by Arctic Enterprises for the Scandinavian market, this model is rarely seen in the US. I have not been able to determine how many of these were produced, or how many stayed in the US. It is factory built with a long-for-its-time 15"x151" rubber track. It also has a tunnel extension/rack that tips up in the rear to allow for more movement of the articulating rear suspension rails. Some of this technology was later used again in the mid 1990s. Much of this sled has the same features of the common 1981 Jag 4000's...oil injected 440 fan cooled engine, leaf spring front suspension, speedometer, etc. This sled has had an accessory electric start and tachometer kit added to it. We bought this in early 2006 in New Hampshire. It had license tabs on it showing use in Massachusetts from 1988-1999. It is currently in good mechanical condition.