Hey Fatman...I just got myself a Christmas present much like yours. I didn't post them on this post because they are cast iron not tinplate, but you have opened up that barrier. Mine are American Flyer, both 100 years old and both have fully functional clockwork mechanisms and came with keys.
The first is slightly larger, it is the # 13 and features drive rods and an engine brake. She was first introduced in 1923 so she is 102 years old after New Years.
The next one came with a tender as well (tender on order for #13) and she is a simpler loco and is an American Flyer #10 from 1925. Never had drive rods even though the cylinder casting has the hole , you can see the drive wheels do not have a boss for bolting them on. She also does not have the engine brake.
Both of these are a little more worse for wear on the paint than Fatman's but I really love the old stuff and these were offered at a price I couldn't pass up. I was surprised that although the paint is somewhat worn in places there is really no rust on the castings and no zinc pest on the drive wheel. Now if I lived in France, I would be planning a trip to see FRENCHTRAINS to borrow his new American Flyer passenger cars which are of the same era.
Best Wishes, Happy Holidays, and Happy New Year
Don
