I just got this unusual "love-token" from a dealer's melt bin. While the host coin is a 1913-14 Prussian 5 mark coin, the reverse has been completely obliterated and "Nita Keller Jan 23 1943" with two concentric circles have been engraved on it. In the very center is a figure 8 within a triangle
So is there any way of knowing the exact meaning of this coin? What does the "8" within a triangle mean? Thanks!

