It is most definitely rare... Especially if rarely seen or found.Interesting watch considering it was Frederique Constant who said they created the idea in 1994 with their Heartbeat model
This mode was 1957
Rarity. Can't say, but couldn't find another image of the watch. Only a copy of the last ad in the second post
Not sure what tier the brand belongs to. Third or forth tier
Interesting watch. If low enough. Buy it for the novelty factor, but not for a rarity one. Not all are rare. Even if rarely seen
DON