A two volume hardcover set with a slipcase which together reprints the main stories from the first ten issues of Captain America Comics (1941).
The individual volumes were not sold separately, but they were re-released in softcover individually in 1998 & 2000. Out of print in hardcover.
From www.comicbookdaily.com:
Two factors make this a collectible edition. First and foremost this is Marvels first slipcover book, and their first golden age reprint in hardcover format. This package screams deluxe all the way. Secondly the first printing was recalled because of something drawn on the yellow printer separation for page 184 of volume one.
If you look carefully on the villains forehead in the [first panel] there is an 8 ball and more clearly is a penis drawn on Bucky. Ive heard this was a prank by a printer or one of the art restorers: either way Marvel recalled the collection and reprinted with this panel corrected.