Hi Bob,
Since it is marked for export, and has been altered. Collector value has deminished to shooter status. If blue is original and at 90%. The value would be in the $500 range, give or take.
The relining to .30 Luger is and was a common method of restoring a pistol with a bad bore, to a usable shooter.
Hope this is helpfull.
RS
Looks like old "Fast Fingers" beat me to the draw.