I can now report another Butler flute with "A.L" key stamps. It is stamped "Butler Haymarket London" on the upper body, is of cocus with GS fittings - ordinary rings and 4 keys (Bb, G#, short F and Eb), short D foot, probably with a non-original (and ill-matched) head. All bar the short F key have "A.L" clearly stamped on their undersides.
I'll try to do some photos when I get a chance.
I have also clarified and added to my Metzler info in the relevant current thread.
I also note, Terry, that you haven't quite transferred all the info from this old post of mine
to your various relevant webpages. You haven't recorded my anonymous flute with "A.L" keys in your list of A.L stamped flutes on your stamps page, and you can also add my "Metzler London" (see Metzler thread) to that list, now I've got my info properly sorted out! (It's the one you list against my name as "Metzler & Co., but since I've now reported one which fits that info, you can leave that be.....
BTW, you haven't included MarkP's anon one with both "A.L" and "F" stamps under either of those categories. Nor have you included the // slash mark on one of the "H&I" keys on my "Eastes" Fentum in the Numerical Marks entry, despite commenting on it by the photo......