Can anyone give me some idea as to value of above. Both Horns are engraved with Made by C.G.Conn Ltd Elkhardt Ind. U.S.A. Tenor serial No M144603 Alto 143923. Can anyone verify the dates of manufacture. Both horns have articulated F#/G# trill key and extra vent on F natural. Both are silver plate and without any dents. I think that the Alto is in original case; address is 516 Rue Burbon with a green label HERITAGE HALL. I would like to know whether they have any value, other than scrap value?