Here is what Faith say...
'A little beauty, this Mercury is a traditional short-scale parlour model. With the neck joining the body at the 12th fret - rather than the 14th - the strings are held at a slightly lower tension than on regular models. Another implication of the 12th fret join is that the bridge is shifted further from the soundhole.
These features result in a guitar that is physically easier to play, sounds much bigger than you would imagine and is also simple to handle and transport.
The Spruce top and Mahogany body of each of the Faith Naked instruments is 100% solid tonewood – in keeping with all other Faith series. However, the cosmetics and non-essential dressing has been stripped away, leaving the guitars in their natural, Naked state. Satin finished all over, the tonewood is almost entirely unrestricted in its resonant movement, so the tone delivered is far beyond what is normally expected at this price level.'