Hi, for what it's worth, Batavus used Dbl-winged releases on several of their lower end road bikes such as the "Monte Carlo" (which are usually Emerald Green or Racing Red).. You may have a 1972-74ish MC mixte
I think that at one point, they obtained a massive batch of either German or Huret-made Dbl-winged releases....

I'm still waiting to hear back from Holland about my Batavus "Tour de Europe" sport touring bike

I think the Eagle derailleur could fall into that timeline...