I did not remember where I got that photo, but now I do. Thank you Thomas Lundeval for your fantastic 'Old rally photos, Porsche 911' thread !
Maybe this was one of those DE Market 1970MY stripped (without m470) cars ? (well stripped except for a sunroof ).
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Here is another interesting 'S' model
Marc Etchebers - Mme. Christine Etchebers at the 1973 Firestone Rally
Entered grp. 5 / 3rd overall final classification