Congratulations ! Impressive shape, indeed. As I mentioned in another thread, I got one for $5, two days ago. Almost like yours, but one can see that it was used, not hard though. I have an SSK, and now I was able to compare them.
Did you modify the stabilizer of the spacebar, to make it lighter ?
Now, talking about best finds, I have lots of them, but w.r.t. to $ value, this one would be the best.
I used to consider my best find a Monterey International keyboard with Monterey key switches, which I got for $1 at a garage sale.
I also have a set of 10 WYSE keyboards, for free, from a company which switched to PC's.
I'd like to post some pictures, but I don't know how.