Cookies
4540
Here are more =D
Yes, the Richard Lange deadbeat is one masterpiece to behold.
Here are more deadbeat seconds showstoppers:

FP Journe Vagabond III
Credit: A Collected Man

Petermann Bedat Deadbeat Seconds

Ferdinand Berthoud Chronometre FB RSM deadbeat
Credit: Time and Watches

Audemars Piguet Millenary deadbeat seconds. Very little literature on this piece, although one was sold here on this forum previously
Credit: Foundation De La Haute Horologie

Roger Dubuis Excalibur Aventador S
Yes it is a deadbeat
Credit: Hodinkee