Good eye, canary, I missed the fin.
I will stay with a 1953 Ford for the moment, look at the "frenched" headlamps. Also the size of the car is more in line with my suggestion.
Now, I am no good with Photoshop, and the photo is a bit unclear, but are those not also sealed beam headlamps on the Benz??
I too have been noodling the ID badge but have nothing yet. The style of dress reminds me exactly of what my dad wore in the 1950's so that may be a clue also.
Bill