@Otti..

Year 1974 and 1975 (till mai/june 1975) the tail looked like this.



The 'swallow' is about 2 cm deep and round edges.

Below you see a swallowtail from 'late'1975


There is the 'swallow' about 1 cm deep.

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1967 T2a Panelvan op 17" 'Fuchs' EXIT
1975 Golf LS 'Swallowtail' 20VT EXIT
2000 Audi TT Quattro 225pk op 19" Bentleys en air EXIT
2008 Audi A5 Coupe TFSI 210pk S-line 20"EXIT
1968 Chevrolet Camaro RS 327 V8
1992 Nissan 300ZX Twin Turbo