Last try on photos. I just don't have the equip to get a really nice image. These are out of the flip though. Weight is 1.6 grams
I think you paid a reasonable price...if genuine. I would have someone with knowledge look at it in hand before you return it.
A scale with a higher degree of accuracy would be nice...but you are in the ball park. The official mass of these coins was 1.672g.