The only thing I know about him is that he was raced ( has tattoo ) and must have bowed his tendon and so they pin fired him so that he could keep going without any pain :( that's just what im thinking...
It is to quicken healing.
And both front legs are pin fired, at least that is what it looks like in the photos.
It is not uncommon for track people to pin fire. Some old time trainers feel it makes the bones stronger.
So, him being pin fired means little to nothing about his history other than he trained for the track.
The tattoo does not necessarily mean he actually raced either. It means they planned to race him.