The Mk 21: 'The Viking',
The Mk 21 is essentially a 'shell' that has been specifically designed for the Viking Corporation for use aboard their luxury cruise liners, popular among the older inhabitants of the galaxy.
These luxuriant vessels are fitted out with a decor styled upon the Ancient Earth myths of the Norse peoples, with the interior of the vessels designed to reflect an ideological view of 'Valhalla', the Norse warrior afterlife.
All of the Androids aboard these travelling theme parks are 'clothed' in the 'Viking Shell' of the corporation....
Shown above is an image of the Mk 21 in its 'blank' state before it has received its company colours.
As mentioned, all of the 'Viking Androids' look the same but, as it is a 'shell', the Android itself could be of many different configurations dependant upon its programming chip.
Travellers thinking of misbehaving on 'Viking Cruises' should beware as that hammer in his hand may not just be for effect!