The smoother appears to be a 17, which as pointed out, it the more expensive version in the coffin smoother line. As to prices, Norris have gone way up, and way down, in value over the years, so I wouldn't hazard much of a guess. Top pricing goes to the plane with the original iron, cap iron, with matching numbers to the plane body, and with an adjuster and no repairs.
http://www.jimbodetools.com/Sweet-Early ... 35105.html
Note that this is his asking price, no idea what it will actually sell for.
Since yours does not have the original iron, no adjuster, and a repair to the handle, it would be hard to come up with a value. Some 17's were cast, as shown in the catalog illustration ( the front of the plane is solid metal ) and some, like yours, appear to be dovetailed. BTW, love the lever screw, the little knob on the front is very cool. I just finished making one for a St. James Bay Tool kit plane I am working on, and my attempt to reproduce that shape missed by about a mile.
You might look here for info on values of the other planes.
http://www.thebestthings.com/infill.htm He is a retailer, so expect that you would get much less than he is asking for if you sell it in a private sale. I understand he sells on consignment, and that may be an option to explore.