It's the 5783 Eagle Castle, you can find it on Playmodb.
Definitely worth a go if you like System X castles, and can get it for under £30, not counting all the extra accessories and figures in this auction. I dislike the huge keep pieces in 3268, as they allow no modification, this has all the elements you need for a siege.
I got two of these at TK Maxx as my first foray into castles. The whole front wall - two half towers (their inside is open to the courtyard) and drawbridge assembly is all one big piece after clipping together, which can make it limiting. This System X castle (in case you don't have one) have the battlements iincorporated into the wall, so you can't increase the wall height.
This is to to 3268 as 3667 was to 3668, as 3446 was to 3450, and 4866 will be to 4865 - except 4866 and 4865 probably can't be connected together to make a huge castle do to the clip system's inherently poor design.
