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Cool, that was what I figured. It’s just been a while since I did any geared stuff!
There was another photo of the back of the cassette where it was more obvious that there was a pattern of two ‘shaped’ teeth/ramps then 5 normal ones repeating around the whole cog so that convinced me it wasn’t wear and I bought it.
Good to have my hypothesis confirmed!
M_V
I'd say shift ramps.