Jonas Kahnwald is in post-apocalyptic Winden looking for a way back to the present. He wears a chain with a silver pendant featuring Saint Christopher, the patron saint of travelers and the namesake of the Winden congregation.
Season 2 : episode 6
A symbol of love
Jonas finds the pendant in 2019 during his last carefree day at the lake with Martha Nielsen. She puts it on a chain and gives it to Jonas just before they have sex for the first time.
A year later, Jonas has disappeared, but Martha hasn't stopped loving him. Soon after she learns about the possibility of time travel, the pendant appears on her pillow. Is it a sign from Jonas? Only indirectly. The Stranger snuck into the Nielsen's house and placed it there.
In a different time, Jonas' older self Adam is holding the pendant in his hand. Does he still care about Martha?