Yes I expect this car was built from a zakspeed gp2 car as I found some interesting information in a german book. Team Ringshausen entered a zakspeed gp2 car in 1976, which was converted to national gp5 spec (no huge arches) and entered as an RS1600 in 1977. The photo comes from 1978, so it would be quite logical the RS1600 was converted again, but now to proper group 5 spec. However there is the opportunity of course that Ringshausen may have px'ed the car at zakspeed for for an already existing Gp5 escort.
I was also gobsmacked seeing this car. I think I have to ask some germans over on another forum.
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