Can my fellow members recommend a set of tools to help determine coin diameter and weight specifications? I found only one 1970 Spain coin set for sale in over 10 years of curating my World Birth Year Set.  The seller had a good rating and the negative ratings did not deal with counterfeit or altered items with the only concern being a no returns, all sales final policy. I gambled and bought the set. I weighed the three key coins from the set without a match to the Krause publication figures. I am trying to save the $39.00 fee per coin by sending them to a third party grading service only to have them come back in a body bag. If I can be reasonably sure they are genuine, I will spend the money to have them authenticated but need a way to get to that point. Any ideas would be greatly appreciated. Thank you all!