Here is the description that Vectis had provided:
Matchbox Regular Wheels No.44a Rolls Royce Silver Cloud - unlisted Stannard Code - darker shade of metallic blue body with smooth roof interior, bonnet interior without casting pips and thin side panel braces, front and rear silver trim, matt black base, metal wheels with domed crimped axles - Mint apart from factory casting flaw to roof in generally Excellent type B2 box. Please note model has entirely smooth roof interior without the central casting pip behind the windscreen associated with the 1st issue of this model and may possibly be a pre-production issue.
And here's the model now that it has arrived in Ohio.

It is a distinctly deeper and more vivid blue than any of my other 44A models. Here it is pictured alongside another early example, a Stannard code 2 with metal wheels.

And indeed it is as smooth as a baby's behind on the inside surface of the roof.

Other than the pips being absent from beneath the bonnet/hood and roof the body casting and base casting appear to be identical to my other 44A models. Any thoughts/comments on this one?