Newest Aquisition - Model 60 NIB - Age?

[bemisgt]

Picked up my newest aquisition today, a NIB Model 60 serial # R143299. Any ideas what year? Thanks!

 

[Ashlander]

Between 1974 and 1977.

 

[Lobster Picnic]

That's a beauty. Those ND Model 60s look so nice, like little jewels. Still looking for one I can afford.