This pipe was put together a little oddly, by which I mean there is no nomenclature at all on the briar.  The year is identified only by the hallmark letter ("X") on the silver ferrule, and the only way to tell it's a Dunhill is by the dot on the stem (anyone can do that, can't they?) and the "dunhill" and "AD" stamped on the ferrule. Almost humorously is the 4101, the shape number, that is also stamped on the silver. So, you're good to go. New.
5.3" long, bowl 1.7" tall. Weight: 1 1/8 oz., 33 grams.