Origin
This is a unique ship that was awarded to the player Doc Brown at the end of the Crielere event in 2004. The event was a GM staged series of battles against Guristas pirates and their leader Fatal.
Status
It has been residing in the Entity collection for many years. How it got there is a disputed story. From the old Evelopedia:
"The Federate Issue Megathron is also an event-related ship, similar to the Imperial Issue Apocalypse. It was handed out in the Crielere Incident to Doc Brown. Doc Brown kept the unique ship for a while, then later sold it to DigitalCommunist, who also held it for a long period of time. More recently, Madcap Magician, the CEO of DigitalCommunist's corporation, plotted and eventually stole the ship and subsequently kicked DigitalCommunist from the corporation. Madcap sold it to Entity, a famous collector of rare EVE items. It is still in the possession of Entity."