I have never seen this Seal paperweight: does the signature (next to Scotland) read DC 78 - which would most likely indicate Douglas Cowie and 1978?
There are quite a few such "Dome" weights between 1976 and 1991 - several of which don't show up in any of my sources.
Eagle Dome is the only one not directly related to some sort of sports - but this also exists in blue, not only the "official" brown version.
Then there is (what I call) "Equestrian Dome" - linking sports to an animal.
There also is (what I call) "Pheasant Dome" - including the name "Sandringham", which makes me believe it was made on a customer's request.
Your "Seal Dome" could be on a customer's request as well - or Douglas Cowie just produced one as trial piece, ...