Rarity???

Every now and then, a Kayak rarity is discovered. This particular single is one that I had never seen before: a single with "House For Sale" (1975) by Dutch band Lucifer on the A-side, and Kayak's "Mammoth" on the B-side. It was offered for sale on eBay, but my Swiss friend Max made a higher bid than I did, so he ran away with the single. Anybody else who has this for sale??? It is obviously a Dutch promo, and the cat. nr. is 1A 006 26412. It was released by Bovema Negram...