The hype surrounding this Maiden promo is legendary and apart from the ultra rare Japanese 2 Minutes To Midnight promo vinyl, Where Eagles Dare is the rarest and the most difficult of all Maiden promos to get a hold of.
Please believe me I say that you will not be able to pick this record up cheaply. This a strictly pressed promo and mint copies are harder to come by than a decent song on a Slipknot album!

Obviously released to promote the Piece Of Mind album away back in 1983 this is an unassuming promo vinyl but with a distinct cover and strangely the b-side is Run To The Hills from The Number Of the Beast album?

One of the first things to notice about this record is the sleeve. It is not a standard paper sleeve but a rough sleeve with an almost vinyl feel to it. As you'd expect the records printed information is all in Spanish with only the song titles in English. The record has no center and the record's label is white.
Have a look at the pictures to get a better idea. I have had a good look over the inside run off grooves of both sides and can find the following inscriptions:

Side A - 034 A with a diamond shape after the A
Side B - 034 B with a diamond shape after the B

If you look at the pictures of the records labels you will see S.E.R. - Guadalajara 002131 on side A. This is just a sticker used by the Spanish Radio Station that received the record and will not be present on other copies.

Details:
Where Eagles Dare Promo only Spanish vinyl 7''
Where Eagles Dare 'Donde LAs Aguilas Se Enfrentaron' (Harris 6.08)
Cat no. EMI 034-P
backed with Run To The Hills 'Corre A Las Colinas' (Harris 3.50)
Produced by Martin Birch
Value: £250/$360