Beware! There are a lot of pretty 'bondo & paint' jobs out there covering 'swiss-cheese' classics and this could be one of them.
That 190 appears to be repainted and the cracks radiating from that ding look like separated filler.
Even if you don't mind driving a rust-bucket, if the rust extends into critical areas such as the suspension mounts, there will be safety issues.

Be sure to get some assurance from the seller about canceling the deal if the car is not as described. Recommend getting a cheap round-trip ticket to inspect the car, preferably before the auction ends, but certainly before having to arrange shipping back home.
I'd expect that 190c to be about as 'quick' as your brothers 5-speed 2.2 190D. Perhaps quicker up to about 30 mph. Good luck.

Happy Motoring, Mark

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DrDKW