Yes, it is! Good find...
Incredibly enough, we actually have the racing set's sister car, the East African Safari Nissan 240Z, that I found on... eBay for peanuts years ago.
The two models were devised (by moi!) in 1974, while I was doing time as project engineer of the slot car line for the famous Santa Ana company. The "East African Safari" racing set never saw production, because the management felt that the extra cost of special paint plus adding accessories would send its retail pricing too high for the market.
These two models were the first toy cars suggested for production, to be painted with a simulation of mud on their body and windshield, with a simulation of windshield-wiper action. The first production toys with such detail were late 1970's Polistil 1/20 scale rally cars. The extra lights etc, were injection molded in prototype aluminum molds.
Several bodies of the Porsche RSR and the Nissan were painted by the model shop in the special colors, but only one of each model was fully completed. I have no idea where yours came from but obviously it escaped the company and was on the open market...
However the other painted bodies survived (I saved them!) and are today in the vault of the LASCM (www.lascm.com) with enough of the special parts to be completed some day.
Here is the other car from the prototype set:
If you want to get rid of your Porsche for greed and profit (
), please let me know and the LASCM will be pleased to purchase it from you.
One good thing: this Porsche originally designed for the Cox toy line with the Brumos decor put me in contact with a man who became a truly good friend and remained that to his last day: Bob Snodgrass of Brumos Porsche fame. Bless his soul.