Both came from Melanie Vauvelle (an ex racer over here in the UK). The Haro 'YOP' plate was hers when she rode the mightly YOP race at the
Bercy stadium in Paris in 1985 I think.

I'm guessing the original Zeronine IBMXF plate came from the Worlds in Slagharen in roughly 83? - thats a complet guess!
It was possibly won by a Hutch rider as it has an old Hutch rub-on decal on the reverse.