Notice the careful wording of the description. Nowhere does the seller actually claim the flag is of any particular vintage, except to say "old" in the title. The "date" is just what's rubber-stamped on the flag. To be fair the item is listed under the "reenactment-repro" category, and the starting price is not too far off the retail cost of some of these fakes / decorative reproductions, but its value is only as a decoration for someone who does not collect period ACW items.

The title also includes the teaser "UCV." I guess it must mean "unwary collector version."