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Here is a prototype pre-production of the miniature Airport Fire Engine produced in a very heavy resin-type compound, not the lighter plastic-type resin that we are usually familiar with being used with Matchbox pre-productions and prototypes. I have never seen a model made of this material before. We found this in a collection we are sorting.

It was mentioned during our Illinois Matcbox Collector's Club meeting that this may be made of a material called "Polystone". Below is the results of a google search about this compound:

Polystone is a compound made up largely of polyurethane resin mixed with powdered stone additives that give it added weight and the porcelain or "stone-like" feel that resulted in the materials name itself. Polystone is durable and highly effective at maintaining a sharp paint finish.

Here are Bob's resized images.
Ghosthunter.

Do we know why these types of models exist in what appears to be a more refined resin mix. The model looks to be very well finished, even on the underside where it is not normally that important on prototypes. Would this be presented to the headquarters of the Fire department?

Ghosthunter.