That's one amazing Coronella!! Since 3 weeks I'm walking in Coronella habitats and I have encountered a subsequent number now, but only the regular grey or brown specimens. I never found one snake as bright as the one you are showing here. But look at this one:
here are two scans (same specimen) from slides from Weitwörth ( a few km north of town Salzburg), shot on May 2nd, 1992. nearly adult male (approx. 45 - 50 cm)