Johannes,
Thanks for your time anyway!
Andreas, Kaki3152, thanks for your references, and Jörg, four your precisions. How many planes did theses "Alarmstaffeln" or "Einsatzstaffeln" have?
Were the Werkspiloten their usual pilots?
Are there any pictures of the Alarmstaffel Erla machines known?
As a side note, I just posted two pictures taken in the Spring of 1944 at Erla VII and at Antwerp- Deurne airfield, depicting Erla built or retrofitted Bf 109 G-6's; one of the is in the W.Nr. 410 xxx range as can be discerned on the photograph:
http://www.flickr.com/photos/2809206...in/photostream
http://www.flickr.com/photos/2809206...in/photostream
Thanks in advance
Marc