How about a 201? According to ISMACS they made the 201K class from 1934 to 1981.
Also the 221s were made up until 1970 so you should be able to find one of those for 1966.
The 223 was made from 1966 to 1970.
The 274K was made from 1965 to 1966.
The 275K was made from 1965 to 1967.
There is a lot of information on ISMACS pages. Here's the one I got the above info from:
{
http://www.ismacs.net/singer_sewing_...s-200-299.html }.
Joe