http://cgi.ebay.de/Bass-Warwick-Streamer-aus-1986-beschaedigt-mit-Case_W0QQitemZ7376023226QQcategoryZ87490QQrdZ1QQcmdZViewItem
 
What do you think. Is it possible to repair such a broken head so that the bass is playable like before?
Just curious.  
 
Harald  
 
BTW: No, it's not mine.

Hi Harald!
YEs I think it is very well possible!
Seen the major surgerey that has been accomplished to Mikes' Wife (huhuh THAT sounds weird) this must be possible also. Though I think the cut must be replaced on the neck part for stability.
 
Paul TBO

Hi Harald,
      Some time ago I had a 6 string Warwick Thumb bass that suffered the same sort of injury.I sent it to the Bass Centre in London and they did an incredible job of repairing it.To be honest,I'd given up hope of ever using it again.
      It looks like a bad break but I'd seek the opinion of a reputable luthier-There's always hope!.
      Best Wishes and Frohe Weihnachten!
                          Simon.

that's a do it yourself job...just glue it, clamp it, & let it sit for a day then BINGO!!!

Here's the catch,,,,, a repair shop is going to do the (EXACT GLUE/CLAMP) & let it sit for two or three days and charge a sh%t load of cash for somthing a kid can do!.

Here is the repair to Mike's bass that Paul mentioned above.
 
While Keavin may be right, personally I think you would want to get an expert to do the work.  I've seen basses on Ebay with headstock repairs that were done by luthiers that, while maybe they played fine, just didn't look good.  If it were an Alembic, I would recommend having Alembic do the work, since I think that adds value to the bass that having such a repair done by others would not.

Yes, this can be fixed and with an experienced luthier will last a very long time. Maybe send it back to Warwick since you live in Germany. I always like taking/sending my gear to the manufacturer when I can. The manufactuer's know their stuff & it only makes sense to me to get it to the people that made it. If not I take it to my highly capable repairman.

I agree.  Definitely should be fixed and used.  An expert can do the most reliable and cosmetically-pleasing job.  Or you could take your chances, glue it, clamp it straight and sand and touch up the finish later (perhaps the trickiest part of the job).
 
Many, many old Gibson mahogany necks have required headstock repairs like this.  If done right, they play fine.