All coins are at least double dies. Double means two so double die means two dies and coins are struck using two dies. Doubled die means two images in the die.
Welcome @Mark Kenny, even though I see you've been a member for over a year. The New Member title is due to your low number of posts, so I'm sure you've read enough on CT to have a feel for it. The term DoubleD Die is a contentious point for many members, thus the comments. I would like to add my usual spiel on photos for your future posts. You should always post FULL IMAGE photos (after you upload your photo, two buttons appear: Thumbnail and Full Image, click Full Image and your photo appears full size on your post and is easily enlarged by clicking on it. Always show both the obverse and reverse, even if your question is just about one side. Members can often give more valuable information having both sides to evaluate. Crop out superfluous background so just the coin shows, and post photos with correct orientation so members don't have to turn their computer in some awkward fashion to view it properly. Add close ups of areas you have questions about and make your questions as definitive as possible so we know what you are asking for. And try to have the best lighting possible to show the most favorable photo of the coin. Hope this helps in the future. Good luck.
