There are actually Limiteds that do not fall into the category of Spring or Fall Limited, but outside of the Builder's Reserve guitars, there haven't been many limiteds for a while now. Some examples of past limiteds that do not carry the Fall or Spring designation would be:
The Liberty Guitar
The Gallery Series (Koi[blue quilted maple dread], Turtle [quilted maple GA], etc.)
Running Horses guitar (sitka/maple jumbo)
The Pelican guitar(PG-LTD)- 63 made in 2003 (sitka/myrtlewood GA)
Cujo14- 125 made in 1997
The Pallet guitar
Anniversary Series (every five years)