[Merlin]

I think you are looking at the Flugbuch Karl Ebert.

During the time frame you are referring the winter was very cold and has had a lot of snow at Warnemünde. Therefore, after a first test flight at Warnemünde, the new aircraft were ferried to a warmer region where the final test were carried out in cooperation with Luftpark Reims. All those aircraft were delivered afterwards to units in France or Belgium.