Ok, as for values going up- blame it on friend Walt. Before his magnificent book came out, Ithaca collectors were shooting in the dark with suppositions. Walt did all the work to tell us about Ithaca guns and Ithaca people, the double guns and the repeaters, and the prices started to rise.
Because of Walt I cannot find a Grade 4 NID anywhere for 1200 bucks.
As for manufacture numbers, the overall winner is LC Smith, at about 440,000 of all types. Ithaca gets about 410,000, all types. But if you compare hammerless boxlocks, Ithaca wins hsnd down with 363,000 to Lc Smiths 351000 LC's. The Fluzie alone sold more than Parker, Winchester, or Remington.
Regards
GKT