Recently picked up a very nice, blued, new model single six convertible with both cylinders for $400. plus tax. Serial number puts it at circa 1980. Took it home May 19th; took it out next day. It's a heckuva good shooter no matter which cylinder I'm using. Don't know how much of a premium I paid for the convertible model vs. 22LR only but the convertible was what I was looking for and so far I'm really liking this piece.
