Very good-looking 4/4. I hope you have a lot of fun in it this spring.
Regarding your model year, for the 1961 model year Morgan changed the dashboard switches from push-pull type to white toggle switches. So your car was probably a 1960 4/4 that was not US registered until 1961. My guess is that in the 1960s about a third of all Morgans were registered at least one year (even two years!) after the official factory date. Morgan started model years as of the Earl's Court show in October.