Recently re-found this article about RS #1177.
It´s from Finnish car magazine Moottori, issue Sept 2004.
The article is written by a general motoring writer with no deeper Porsche knowledge.
It says that #1177 has been specially built by Competition Dept for works driver Leo Kinnunen.
Special details include RSR wheelarches and tea-tray rear spoiler. This type of spoiler was chosen because Kinnunen took part of testing and developing it.
#1177 was delivered to Finland and driven by Kinnunen as a practice car for Rally of 1000 Lakes (in 1973 or 1974 presumably?).
After the event it was returned to Germany. It has never been raced. It was imported back to Finland in 1988.
The gentleman who owned #1177 in 2004 (and probably still does) is a well known Finnish car dealer/collector and historic racer.
He had tried to buy the car since the late eighties and finally succeeded in buying it in 2001.
The mileage at the time of writing was 57700 km
-mika