That's a great find and appears to be in great condition...
My limited BHP research says that none of the pistols made under German occupation had the mag disconnect, as the Germans didn't like it and wanted the manual of arms to be similar to their other handguns. The Germans believed in a professional, well trained army, while the French model was to rapidly mobilize a huge (though not thoroughly trained) reserve force. (The Maginot Line was actually designed with the intent of delaying an invasion for 2-3 weeks to allow mobilization of their reserves.) Since the French reserves were not well trained, they insisted on a mag. disconnect to protect their troops from ADs. And the BHP was purpose designed for the French armed forces.... though they never bought it and chose a French made pistol instead.
The comment made about guns assembled with pre-war parts is spot on, as Herstal had ramped up production prior to the invasion and inventories were flush. Then the Germans repurposed or removed many of the production assets to make parts for other firearms. Workers at Herstal were forced to continue doing the jobs they were trained to do in support of the German war effort, but the production numbers never came anywhere close to their pre-war numbers. One theory for this is that they deliberately dragged their feet, though parts production and materials availability played a big role as well.