Take for instance the Marquess floor spring manufactured by Stanmore Springs Ltd, this floor spring is identical to the Coronet and as discussed the Newman's 700. The Marquess was branded as such not because of any difference in the floor spring itself but in the way it was able to be laterally adjusted. Stanmore Springs supplied the floor spring without an adjustable shoe because its lateral adjustment could be altered by a floating bar attached to the outer box used to concrete it into the floor. It was this difference and this difference only that made a Coronet into a Marquess.
The picture below could therefore either be a Coronet or a Marquess, without knowing whether it was originally supplied with either an adjustable shoe or an adjustable outer box there is simply no way to tell.