In the pre-WWII days of diecasting, many Dinky Toys, especially trucks, were a blend of several makes that resulting in nice looking models. However, these were impossible to link to a particular manufacturer.
My first example of this is the 22c Motor Truck, first made around 1936, discontinued in 1941, then re-introduced in 1946 for a few more years.

Many ardent collectors have tried searching for a matching prototype, such as a Bedford, to no avail. Headlights, which were separate fixtures in those days, were especially difficult to model, so in some cases, Meccano simply left them off. This particular model is a very, very early 1946 issue, as it is still using the pre-war style white tires, the smooth, non-ridged black wheels, and the use of black fenders.
The next one is another very early post-war model from around 1945, of the 25s 6 Wheeled Covered Wagon. This model was first introduced around 1938, in a military version as the 151b Transport Wagon, and is a somewhat generic design, based on a couple of English trucks from that era. The reason I know it is from 1945: the smooth, non-ridged black wheels, and the very lightly treaded tires… a pre-war item. They used up leftover stock for a very short time after production resumed in 1945.

About the earlier military version, one of the 1938 issues of the “Meccano Magazine” stated that this model was “based on several vehicles made in the 6 wheel configuration for the government”. Dinky collectors have found many different photos of similar military transport wagons of that era. Two of the closest may be a Leyland Terrier (photo) or a Crossley FWD Airfield crash tender (photo).
Even though these little models have no true identity, I still love the look and charm of a bygone era.