It'll be 2005ish.
It's done a lot of hours. There's doesn't seem to be a belt running to the generator, therefore is he not being honest about the burners? They mustn't be running. Unloader looks bodged up and not original.
You could be into £2-4k to have it overlooked and running spot on. The burner coils are just short of £1k each. You'll be devvo'd if you found you need them when they're stripped down.
But on the bright side if it stands someone at £15k (58k new by the way although more advance model now trail jet 30) it would pay for itself in a month.