...Next in turn are two tenors. An "ultra cheap" gfourm (Yani copy) and a 1963 Dörfler & Jörka . Both are ok. I think gfourm is better for a beginner; good ergomoincs and a modern voice. Easier to move to another modern sax from a gfourm. The Dörfler & Jörka is a good sax as well. Body and bell...
I'd say this is the more pertinent issue. As a beginner what you need is a decent sax in good working order, which you already have in the 10M, and had in the Hanson.
By all means buy the Selmer if it'll make you happy. You can clearly afford it. This is not a problem most of us have!
IMO all beginners should start on a either a generalist Yamaha 3C or the classical Van Doren optimum AL3 or TL3 (use Van Doren traditional reeds with the optimum, a couple of 1 1/2 and 2s will do to start).
Never heard of it. Most stencil metal clarinets are beginner instruments and pretty awful but with it being a full boehm there's a chance it's something decent.
Old Buffet serial numbers are in that format but but it can't be if it's made in the USA.
Would somebody recommend a reed for soft, dark, smooth tenor playing (as a beginner, of course)? I don't like my loud playing and my harsh attacks. I am currently playing on a 2 Vandoren Classic, I think.
Your previous piano skills give you a great ”leg up” - true beginners spend a lot of their first year finding out about major and minor scales and getting their ear in - forget about the workshop for another month and then see how you feel…