How about this tachymeter? Heuer Carrera 73563N

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Evening guys
Spotted an interesting 1970s Heuer Carrera 73563 N with a second revision dial. I am not sure about the tachymeter ring however. I've heard that a lot of cross reference borrowing was going on back there but this looks more like the ones you would find on the two-sub-dial types like the 1153s.
Anything to worry about?
 
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The tachymeter ring as far as I know is the same part across the automatics / two-registers and the manual wind models. In the case of the second execution, I'd expect to see the tachy-at-1 version like the above more often than the earlier, tachy-at-3 version. Can't guarantee it's absolutely original to the watch, but it would be correct in my opinion