The first appearance is Quantum & Woody #1 from 1997, but there were two cover versions, a regular art and a "painted art". Since it was from Acclaim (post-Valiant), and after the industry crashed, and since it was "such a weird book", there are few Valiant collectors who considered Quantum & Woody as part of the Valiant universe (or as a "must-have" for their Valiant collections), especially before 2013.
For almost 20 years, the value of Quantum & Woody #1 has been about $2 to $4 for the regular and about $3 to $5 for the painted. Neither of those values, plus the fact that the book was from Acclaim (but not "rare Acclaim"), has made Q&W "slab-worthy" when it comes to getting slabbed Valiant collections completed.
The CGC census has a few listings for Quantum & Woody #1 (June 1997) because they spelled it both ways "Quantum & Woody" and "Quantum and Woody" and there is the painted variant (they just call "Variant Cover"). In total, there are about 8 copies graded, and another two copies of the Retailer Review, which was a black and white preview of Q & W #1.
There are a few sellers who confuse Quantum & Woody #0 as a first issue, but #0 was about five months after #1.
The Q & W trade paperbacks (1998, etc.) had very low print runs, maybe 3,000 or less... so collectors have actually paid a little more for those ($10 to $40, depending on which trade) and it's not surprising that they may also be on the CGC census.
Thanks, Greg. I know what all of the different books are, and I figured that the #1 with the different date was probably the first trade. But that still left multiple entries for #1 from 6/97, one of which includes all three variants (regular cover, painted cover, and retailer review). I was wondering what the other entry was, but if it's a matter of CGC using the ampersand and "AND" to label the comics, that would explain it. BTW…
Nonsense!