Hi Egbert, I will upload this evening the scan, in it it is clearly written 501325 but I won't argue if it's correct or not, i'm just forwarding what I found
As for Culmea Neagra it seems to be way far more to the NW of Toplet, about 50 km actually so that clearly is not the actual crash place, i will look these days on a set of maps of the area from the 1930's to see what similarly called places are near Toplet.
Culmea Neagra as of now :
http://bit.ly/1zv2Ik4