Hate to play "price police" but here in the North East I have purchased 5 Gottliebs of this vintage in the last 6 months and the most expensive was $1250 fully shopped with LED's installed and in excellent condition all around. The others were a grand or less, worked with minor issues and were in better condition than the unit for sale.
$1300 if it was fully working perhaps, playfield condition makes it a hard sell.
Gottlieb in this timeframe gets little love I'm afraid. There is exceptions but they are that, exceptions.