I tested a 1921 morgan dollar on the correct 90% date setting and the indicators show red... but when I test it on the post 1900 setting the indicators are perfectly in the green? Can you help explain what is happening
It's 1921, it's post 1900. What I've seen of these machines, it's VERY specific to those settings, and they go up to 1940's and another date, but I don't believe there's one for 1920's or around there.
