NAC 12N, Serial No. 0123, has 6 x Daughterboards, looks original and has knife edge pins:
- NA112 iss.3
- NA114 iss3.
- NA111 iss.2
NAC 12S Serial No. 0739, has 7 x daughter boards, has the later push in pins and an Alps Blue Velvet 20K volume pot, which obviously isn’t original.
NA325 iss.5
NA222 iss.1
NA321 iss.5
And some after market 729 boards; this one’s obviously been got at.