Many thanks for the help. One thing is obvious: the Osprey books, excellent as they are, are not going to be enough and I'll have to buy some more books.
FOGH: thanks for that. I'd never have known that.
modelwarrior: interesting, although the figure has been painted as an Imperial trumpeter:
traveller: this is really helpful. What I really wanted to know was whether Swedish trumpeters wore tabards, like Imperial ones and, if they did, how they were decorated. I'm aware that TAG's Swedish trumpeter is not in a tabard. The illustration which you've reproduced is the first of a Swedish trumpeter I've seen.