F&S is Fichtel und Sachs, so yes, that's the same Sachs.

Check out: www.hubstripping.com, website devoted to IGH's. Somewhere on that website is an explanation --or a link to and explanation-- of the F&S date codes. Yes, there is a date; but it's probably in the form of a letter, not a number.

I'm glad you got the bike! It looks pretty cool.

What do I know, but I'm kinda doubting there was ever any kind of gear change mechanism on this bike. Derailleurs and coaster brakes don't get along well, but it would be easy to loosen the axle nuts, put the chain on the desired cog, and tighten 'em up again. Come for a ride with me out on Long Island this summer, and you'll see: put it in the small cog to ride to Montauk (tail wind), then the big cog to ride back (head wind).

Edit:
Here we go, a page on dating F&S hubs (it says yours is a '69)

There's also this page at Hubstripping.com from which I quote:

Dating a Fichtel & Sachs hub:
When you have a look on th hub shell of old Fichtel & Sachs Torpedo hubs youŽll find a letter on it. They started in the year 1958 with the letter “A” and went with each year forward. The “I” and the “Q” was not used to prevent a mix-up with the “J” and the “O”. In 1975 the letters moved on the brake lever. On the brake lever youŽll find two letters. The lower on represents the production year. The upper letter the production month.
A = 1958 D = 1961 G = 1964 K = 1967 N = 1970 R = 1973 B = 1959 E = 1962 H = 1965 L = 1968 O = 1971 S = 1974 C = 1960 F = 1963 J = 1966 M = 1969 P = 1972 T = 1975 U = 1976 W = 1978 Y = 1980 A = 1982 C = 1984 E = 1986 V = 1977 X = 1979 Z= 1981 B = 1983