The cross posted by Terry is an easy one to spot. The crown is way to small.
That's why this style has been known for years as the "small crown fake"
Another easy tell is the really bad paint that always has blisters in it.
This one has been around a long time and fooled a lot of people until they started
turning up with the same crown, frames and paint but as 1813s and 1914s as well
as 1870s. --- The faker got greedy.
Here are some pictures of "small crown fakes". All copied from dealer sites or off