Here are a couple of my observations. First the data card shows light blue (tex) interior, not blue leather. The seams in the door pannel are heat bonded like TEX cars, the seams were sewn on leather door pannels. The seats have been recovered in leather.
Dash boards on Mercedes (all models) with blue vinyl were proned to cracking especially around the speaker opening, these parts were most likely replaced with black parts from a wrecked car? recovered in black? or repaired and redyed balck?