According to Breitkopf in Germany, Score and orchestra material of the 1st Violin Concerto are lost. You cannot rent it from them.
The last copies apparently got destroyed or lost in WW2.
After a long search, a handwritten copy (in a copyist's handwriting) of the score was found. Comparing it with the violn/piano edition, there are minor changes besides a lot of obvious writing errors. Apparently, Grädener had changed a few things in the process of creating the piano reduction or while proofreading it. Usually, the composers at that time made the piano reductions themselves if not otherwise mentioned.
That means, score and parts will be newly written after comparing them carefully with the printed violin/piano edition, which is almost without misprints.
The last copies apparently got destroyed or lost in WW2.
After a long search, a handwritten copy (in a copyist's handwriting) of the score was found. Comparing it with the violn/piano edition, there are minor changes besides a lot of obvious writing errors. Apparently, Grädener had changed a few things in the process of creating the piano reduction or while proofreading it. Usually, the composers at that time made the piano reductions themselves if not otherwise mentioned.
That means, score and parts will be newly written after comparing them carefully with the printed violin/piano edition, which is almost without misprints.