Bordersign along NS Eindhoven-Weert divison.

This sign is placed to mark the border between Brabant and Limburg
along the NS division Eindhoven-Weert (Near the A2 viaduct, Maarheeze)
This picture is taken from the Brabant side.

According to an old railway employee, the sign was placed by the 
railways during the SS (StaatSpoor) period. 
Who can tell me this is true?  

Foto + scan: Paul Sonnemans (p.sonnemans@12move.nl)