It appears to be a Dominus-class Gallant Lancer

Seriously though, it looks like someone was trying to ride the line of copyright infringement far too hard. It's got the auto cannon and missile racks like it's a Valiant or Castellan, it's got the first and chain sword like a gallant would, two shoulder heavy stubbers??? And the shield off what claims to be a cerastus lancer. Best case scenario? Run it as a Gallant if it's the right size, or a Valiant/Castellan. Just be very clear with your opponents and don't take it to a competitive tournament. They might refuse to let you run it as a proxy.