I'm going to go with 1 for the skills question based upon the order of operations.
(1)*(2) which equals 2 and then subtract one to obtain an answer of one.
As for the duck, I really don't know. I know that a bunch were made in Germany and Japan, and quite a few in china as well. Based on the tabs with how it is put together, I am going to take a wild guess that it is from Japan. It is difficult for me to guess it's vintage as well, but a while it could be older, I will guess late 60's. If I have to nail it down, I'll go with 1968. It probably takes a removable key to wind it up on the far side. All are guesses. Rich