Winselmann Titan

This little beauty was given to me a few weeks ago but it remains tantalisingly shut.  

The key is missing.  I have tried a paperclip and screwdriver and we even had a go at unscrewing the beautiful brass plate at the opposite end to the lock but, it still won't let me in.  I know something beautiful is inside.  I have seen pictures of these Winselmann Titans on the web.  I really want to get in it because my old faithful Singer has decided to stop working. 
For now, I will just have to sit and admire the lovely casing whilst I await and expert machine fixer and lock picker to come and open it up.  In the meantime, if anyone has any suggestions, about how to get in it without damaging the lock, then please let me know!