That moped is based off a 1968 Batavus design layout.
It might well be a Jawa Babetta 210, which is as close as I can pin it down...and I only know that cause me and Fred restored an identical one for my ex.
Jawa, Trac, and Batavus use the same engine design, or did at the time that moped was built, so you have decent parts availability except for the Carb (which is an Encarwi).
As for Value, I suppose it has some, but it's dropped off the bottom of the BlueBooks and the average offer I've seen for them is around $200, which I consider to be mildly insulting cause the 'ped is a classic design and prolly worth more (tho you wont likely GET more).
I would keep it for myself, or at least in your family by giving it to yer cousins, because it really is a sweet piece of work and very simple to repair, not to mention being based off a classic and solid design.