I couldn't find any markings on this trombone but it is very old and all in all in quite nice shape.  In closed position it measures 40 inches long.  I know nothing about trombones so if anyone needs further information feel free to message me.  It is a beautiful looking piece.

On Jun-28-16 at 07:46:27 PDT, seller added the following information:

Hi I just wanted to add that I just slid the slide all the way off for the first time, while figuring out shipping.  at the end of one of slides is about a 1 1/2 inch seam split.  I also took a pic.  Please note this update.  The split is very minor but I did not want to sell without disclosing.