Matti Hyvarinen Pendant Necklace

This was my only find at Sunday's flea market. Paid 1,50 Euro. My research tells me that this is by Finnish modernist silversmith Matti Hyvarinen. The top of the pendant has the Dutch sword fineness mark for 925. Any import mark has eluded me, so far. I am not sure if the rubber necklace is original but have nothing to tell me it isn't, either....aaaaah!
Thanks for any info.
I've been a bit busy, otherwise but promise I will show up more often to see and comment on everyone's great finds.
Bonnie