[Dave in MD]

The NK 1535 is a production number. We feel they are for each assembly plant and are probably by body style. We believe they stamped the digits sequentially starting in late 1927 with number one for each body type. In 1930 they probably reverted back to number one for each body style and continued through the end of Model A production in 1931. The Norfolk assembly plant made 3,303 Sport Coupes in 1930, so it appears yours was assembled around mid year. Does it have an oval or round speedometer?
Dave