Unusual Perf/Color Combination On Early Swiss Standing Helvetia

The three stamps below are all "watermark" 182. The stamp on the left is perf 11.5x11.5, Scott #87 1 Fr claret, the stamp on the right is perf 11.5x11, Scott #87a 1 Fr claret. The stamp in the middle is perf 11.5x11.5 1 Fr carmine, which doesn't seem to be listed in Scott. There is a 1 Fr carmine, Scott #97, but it is perf 11.5x11.

Does anyone know if this appears as a valid combination in SG or Michel?

Zumstein lists six different carmine 1 Franc standing Helvetias, but none with your perforations. All six are either 11.5 x 11 or 11.5 x 12

Peter

A forged perforation perhaps?

My apologies. I measured the perfs wrong, it is 11.5x11, Scott #97.