Michael Petrov,
Thank you most kindly for your important informatiom.
Now it seems quite clear to me that Ludwig and Eduard were brothers.
For more information on Eduard Wundham(m)er please see "Info E. Wundhamer Austrian rifle (pics) RARE??" on this forum.
Eduard used different versions of his name as well. His earlier guns were marked Wundhamer while on later ones he put his name as Wundhammer.
- Jani