There were several models and gauges of the High Standard Flite King- Field pump shotgun. Value will depend on exact model, gauge, and condition. Used prices average anywhere from $100 to $300. Many of the pump shotguns made for Sears under the J.C. Higgins name were High Standard Flite Kings.
To determine exact value of a 1904 Marlin 12 gauge pump shotgun, you would actually have to take a number of factors into consideration. The main thing to consider would be the condition of the shotgun.