Subspecies is not specified.
But, given features of head and shell morphology, I tend to think that this is not Galapagos tortoise at all (despite sign). Maybe this is an aberrant specimen (without nuchal scute) of one of the Aldabra tortoise (sub)species.
@Fishapod, What makes you think so it is not a Galapagos tortoise?
Out of interest: this case has just the outlines' of another giant / large tortoise behind it...! Any idea what was presented next to the "Galapagos" giant tortoise?
BTW: I will go and check out what tortoises they have in the collection!