If we neglect bleached colors and obvious exposure to some rough conditions, you would have around 30-40 dollar worth banknote in VF condition, maybe 50-60 in XF. Even though your banknote is SPECIMEN, it wouldnt grade high, or would grade with some comments. Definitely genuine
This Leopoldian franc has beautiful green colors otherwise, when in normal shape, and is very desirable. But my favorite are Algerian and other french style banknotes from Africa, work of arts.
Take a look how a proper franc should look like