Can you ever be sure that it’s legit?

Sometimes you just happen to stumble across something that catches your eye. In my case it was this odd Trickles that had monocolored hair. I immediately thought that this must be a well made custom but I just could not be sure.
Examining her I discovered that she was beautifully rooted (just like the factory ones) and that her tail was held in with a metal clip and washer. Her symbols show the same patterns and colors that most of my Trickle-ponies over the years have done.
At the same time I know that there are some very skilled customizers out there so I will have to seek advice from other collectors and hope that someone either confirms her to be a legitimate variation or that her creator steps forward.