Welcome to the forums from the Wiregrass! Your friend's 29-2 was made around 1971. Our tables say N1 to N99,999 were made from 1969 to 1972. To be more specific likely requires an Historian's letter of authenticity. I'll see if I can narrow it down by locating shipping dates of nearby serial numbers.
Well, I guess I was off by a year. Model 29-2 serial number N65038 was shipped in January 1973. Model 29-2 serial number N65760 was shipped from the factory in October 1972. Model 29-2 serial number N66051 was shipped in March 1973. Model 29-2 serial N70815 was shipped in March 1973.
I think this illustrates that S&W didn't ship in serial number order.