This is also on our bedroom wall:
I see it as the companion piece to piece #5, even though it's a different size (wider, not as long) and consists of illustrations for a game book rather than for a comic.
I'm a big fan of the style of the artists, the Brothers Fraim. The draughtsmanship is superb. Take a look at this detail:
Given that I can barely draw a straight line with a regular pen, this kind of Rotring virtuosity is something I can only admire.
I bought this a couple of weeks after I bought the other one, but from the Fraim Brothers directly rather than through Heritage Auctions. I've no idea what it cost me, but I'm sure that if I were to sell it on eBay I could probably get,ooh, up to the same amount I paid for it.