Built by AMF in the '60's, probably in Little Rock, AR. That tank was introduced in 1960 but the first couple of years used a steel front cover, the plastic version on yours was first used in 1962 I believe. Most serial numbers for this time had a letter as the first character which told the year, yours is odd with no letter visible, but here's a couple of pages from the 1964 catalog, and you can see yours looks very close.
View attachment 1651006
View attachment 1651007My 1960 is basically the same bike as yours with a different rack, tank and the Star Rider sprocket.. These are really well made and comfortable riding bikes... Enjoy.. Razin...