The first cap, if a legitimate gamer, would be 1984, not 1983. While 1983 was the first year of the MLB official licensee tag, the white piping was black (as opposed to white) on the inside of 1983 New Era on field caps.

http://www.ebay.com/itm/201121825770

Also has a mid-80s (1985-1987) Blue Jays cap being represented as a 1977 cap. The center tag (with three lines of red) made its debut in 1984/1985 for New Era. Someone removed the MLB official licensee tag to make the cap look older than it really is.

http://www.ebay.com/itm/141338184575