Fuck that, ask anything you like broseph.
Also, see Catside's response for a serious reply, it's solid.
Generally, if it's a solid blue, don't worry too much if it's an "orphan" if you like it enough and it fits; slap brass buttons on (salvaged from another cheap jacket) and you're good to go.
Shells are something that I just cannot seem to find. I really don't understand it, for the life of me. I've found basically every major maker, untold Savile Row pieces, the ancient, the weird, the rare, and the fun....
...but I never find shells. I have found exactly 2 pair of shells in at least as many years. It's not like I don't find shoes; I've found plenty of great shoe finds (though none from the super elite makes), including several exotics. But just never shell. Thankfully, 1 of the 2 pair I did find fit me exactly and get a helluvalotta use. It really trips me out when people find several pair, or even find more than a pair or two ever.
My neck of the woods needs to up its shell game.