You are right:
The black one got an onion crown, the silver one a standard crown with logo.
I believe that two orders were mixed up and the wrong piece went to Melchior.
Now we have to wait for a post where someone got a Chrono 1938 with the standard crown instead of the ordered onion crown.......
Send an email to Stowa and they will do what has to be done. Their CRM is an outstanding one.