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This is a royal cipher, and stands for Victoria Regina (Queen Victoria). It was used during the time of her reign, so that's when they were made (unfortunately a long period so it's hard to pin down...

First, I think this is a quite relevant thread: http://straightrazorpalace.com/razor-clubs/21585-god-shave-queen-royal-warrants.html

And second, here's two of mine. Joseph Rodgers, Cutlers to...