The Diamond T Prime Mover Tractor (15a) was released in 1955 and remained in the range until 1959.
Wikipedia describes this US truck which was adopted by the British Army as follows: "During World War 2, Diamond T produced a classic heavy truck in the 980/981, a prime mover which was quickly snapped up by the British Purchasing Commission for duty as a tank transporter tractor. Coupled with a Rogers trailer, the Diamond T tank transporter gave sterling service with the British Army in North Africa Campaign, where its power and rugged construction allowed the rescue of damaged tanks in the most demanding of conditions, often under enemy fire"
There are two rare versions of this one, firstly the six wheel version in yellow which is the hardest to find and can be worth over £1,000, the next most desirable is the orange one with grey plastic wheels which are doubled on the rear axles, these then have ten wheels and can be worth several hundred pounds. Most frequently found and worth a few tens of pounds are the orange ones with metal wheels - like the one below.
