A locksmith should be able to copy your key; however, if your key is old, worn or not an original MBZ key it would be better to get an original one from the dealer cut by VIN as suggested. Copying a worn or non-original key results in a marginal product at best. The keys from MBZ cut by VIN work very well and would be fine to copy.

Good luck!!!

__________________
"Rudeness is a weak man's imitation of strength" - Eric Hoffer