In Germany I also saw this CC 2500 from Helling which was building windmills.
Something that springs out of the picture are the large crawlers, these are taken from a CC 2800.
A comparison picture with a CC 2800-1. Among many other things most notable are the different superlift (CC 2800-1 is bigger) and the different layout of the A-frame.
The crane was rigged with superlift, 102m mainboom and 12m LF jib.
On the A-frame the name of the first owner can be seen; Scholpp.
The helping crane was this LTM 1150/1 from Zimmer.