Here is a rather splendid looking but not terribly user friendly Magnetic Constructional Toys set. It comprises a variety of painted / printed / enamelled (I’m not too sure how best to describe the method) metal panels, painted rectangular magnets, two metal support beams plus some decorative parts which are essentially ball bearings and washers. The box is metal so that it can be used as a building base and despite how it looks in my photograph, is dark green.
The panels depict an interesting range of both exterior and interior designs, ranging from the straightforward brick house and contemporary domestic interiors, through a chronologically confused stone terrace house with castellations and Georgian-meets-Elizabethan details to a collection of Moorish arches. The panels with what look like coach lining seem to be intended primarily for bridges although the accompanying leaflet shows them in other uses too.
The toy was made by Goodtoy Products Ltd of Kentish Town Road, London and shows a provisional patent number of 3926. I’ve not had a chance to check this out in the library, but the set appears to date from the 1930s. One thing I particularly like is the company slogan: “A Goodtoy product ‘makes’ a good child”!