Yes, technically 1979 according to SD. Those earliest ones would not have had any stamping on the baseplate at all, just paper labels, but I'm not sure how many were actually produced prior to about 1982/3.
I think they were technically made available to the public in 1979, but weren't truly a "production" model (i.e. something you might see for sale in a guitar shop) until the early '80s.
As for the baseplates, beginning around 1983, SD started stamping them with the large SD logo. This continued until sometime in 1986, after which a smaller logo more similar to the current one appeared. The first versions from 1986/87 actually said "Made in USA" not "Made in America", which came later.