Nice! I have a 99 from the same year that matches your 66! (the 99 is the 3/4 size version of the 66).
They're good solid machines...a little cleaning and some grease and she'll be a great machine to sew on! There are some stickies in this forum about how to clean the machine head without destroying the gold decals. Your decals are on the simpler side, but they look like they're in really good shape! Nice that you got the manual too, that will show you everywhere to grease and oil the machine.
Looks like a nice cabinet too, I like that small size. I want to find one similar for my Rocketeer.