A couple of things here. First off, I have never seen any redness on the edges of a 40% silver half. Have seen a darker area. Anything is possible as a 72D is only 2 years later than the 70D.
As far as I know the 70D was only in mint sets. Best bet is a scale.
There are some inexpensive ones that work great and accurately.
If not, then just bring it along with a few other 40% halfs to a local jeweler. I'm sure they would weigh them up for you. That would be a start.
As far as I know the 70D was only in mint sets. Best bet is a scale.
There are some inexpensive ones that work great and accurately.
If not, then just bring it along with a few other 40% halfs to a local jeweler. I'm sure they would weigh them up for you. That would be a start.

























