How to identify NAC72 boards

I may be a little biased but think I have a really nice NAC72, that looks to have a full set of boards in it. I’m struggling a little to identify just what they all are though, can anyone please point me to a reliable source of info or does anyone know what they are without looking them up?

Thanks, in advance, for any pointers

The FAQ here should help;

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perfect, thanks Richard

Looking at the capacitors, I’d say it’s been serviced.

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My 1978 NAC12 was converted to a 12S by changing the phono input boards from MM to MC.

good spot, 2014 was the last