That scrap you gave translates:
“Beneath your compassion, we take refuge, O Theotokos: do not despise our petitions in time of trouble, but rescue us from dangers, only pure, only blessed one.”
Theotokos = Mother of God
The silver item with the person buried in this article said nothing about Mary.
There is no parallel.
So many possible scenarios....Father gave it to his son...20 years later...the son was adventuring in the Alps...
The Marian request for prayer is contemporary with this artifact thus belying your statement that there was no Marian devotion at this point in time, conservative Mind