No, a brace in such a context means a pair , not a collection . By the way, the plural (in this sense of the word) is also brace .
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Anonymousand this is my antique collection: a brace of dueling pistols. These are one-of-a-kind, museum quality."I think I'd call the dueling pistols the antique part of the collection, rather than a collection in its own right. I'd have to have more than two of something before I started calling it a collection.