I thought my .22 WRF was a 1906, but I was remembering wrong (lot's more of that these days). That's just one of the patent years stamped on the barrel. Mine's a model 90.
Look on the barrel to double-check what you're dealing with. The chambering will be stamped on the barrel. So will the patent months and years and so will the model number just to be sure all the i's are dotted and the t's crossed.
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