X-O Manowar #15 Kotaki Cover
1:50 Retailer Incentive Variant
Diamond Code: MAY131309 ; In Shops: 2013-07-10 ; SRP: $3.99.
Barcode: 858992003031 01541 ; Valiant, July 2013.
This is the limited 1 for 50 retailer incentive variant cover by Kekai Kotaki, shown below with the first page of the story:
Quantum and Woody #1 (below) was also produced at the same time and both were in shops on July 19th 2013.
However, a printing mix up occurred whereby some of the Quantum and Woody #1 variants ended up with the cover from the X-O Manowar #15 Kotaki variant creating an error variant:
Note that both CBCS and CGC categorize comics from their covers (as that is all that can be seen once the comics are encased). CBCS grade these error comics on their standard blue label but note the comics as "Manufactured with the interior of Quantum and Woody #1". CGC also note the error on the label but the comics are on a green, qualified label that is used for manufacturing errors, significant defects and unauthenticated signatures.
In early August 2019, CGC had recorded 23 gradings of the "Mack Variant Cover" with 12 in the top grade of 9.8 (near mint / mint). Note that seven of these were Qualified (green label) gradings and, in all likelihood, most of these would be error copies, however, given CGC don't separate these out in their census they could be other manufacturing issues or non-witnessed signatures.
The error variants are quite difficult to obtain with very few sales; the non-error copies are not quite as difficult to find and do come up on auction sites such as ebay from time to time. There were 400 of these printed (plus any overage) with the a small percentage of those being error variants.