ok, seeing the other thread about a $510 marquee, my marquee is now for sale. $90 shipped. monstrous bargain. 
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BTW the cab #s are model# 50100 and ser# UR00167, so not completely sure what cab it was original.
According to my Atari spreadsheet that I am assembling:
Dragon Spirit - 30100
Galaga '88 - 50500
Pacmania - 50400
But then again, here is a thread from Sav that is almost 4 years old stating he had a Galaga '88 cab with 50100 model number:
http://forums.arcade-museum.com/showthread.php?t=41933
And then here is a member who says he has Galaga '88 with model number 50500.
http://www.arcade-museum.com/members/member_detail.php?member_id=396018
I do show that there were both a dedicated Galaga '88 and a Galaga '88 kit. However, I obviously don't know which model number is which.....
WOW. Figured it would be low run, but didn't realize Galaga 88 was that rare.
And it explains why it is easier to get a Japanese boardset!![]()