1922 AEG Olympia Standard 3:

https://preview.redd.it/xjg7cik3z9ah1.jpeg?width=394&format=pjpg&auto=webp&s=7f9bfe8b0fefd6c940a6f72f63f4db7bfbdb2b0f

Olympia had the exclamation mark on most (if not all machines) - they even made an advertising song about the Olympia sporting that exclamation mark: https://youtu.be/BoD4yFNwvKo?feature=shared