I have one, too, Dr. Jim. It's yellowed, but it's yellowed very evenly for what it's worth. And it's otherwise in terrific condition. I had it wrapped up to sell on ebay one day and never got around to it. Just plugged it into my Mac Classic (one of the old Macs I've collected). Every key seems to type just fine and it's clean as a :whistle:
Now that I'm educated and a keyboard connoisseur I can say I'm surprised how great that keyboard sounds. I took a couple vids and will try to post those for you too if you're interested. So those are Alps? I like Alps.
Anyway, if you think buying from across the pond in Canader is acceptable and you'd like to see more pics and the vids, let me know here and I'll make those available for you. Here are a few with some differing light levels.