I have a 29-2 i don't know the year of manufacture but the tools are exposed in the presentation case. My 29 is in the N400000 group. Hope this helps.

Ok I found this

Starting Number Years

N1 1969-1972
N100000 1973
N200000 1974-1977
N300000 1975-1976
N400000 1977-1978
N500000 1978-1980
N600000 1979-1980
N700000 1980
N800000 1980-1983
N900000 1982-1986