Model B's were imported from 1983-1989, not the 70's, fwiw.
UZI Imports to the United States
Model A imported from 1980-1983, serial # range from SA01,001 – SA037,000
Model B imported from 1983-1989 (stopped by legislation.) Serial # range SA037,001-SA073,544
They're fine guns, I have one. This is the place to post the for sale ad.