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This model is the Glam Toy Products GTP-527 Stremaline Locomotive in GTP livery of green cab roof, red boiler and coal tender and yellow detailing. This model is of similar shape to the Mallard Class A4 locomotive built in 1938.
The model has a one-piece, pressed metal body, 178mm in length. It has been shaped with rudimentary representations of the body lines and boiler features. There is no glazing - all the features are lithographed onto the body. At the front are representations of the boiler's curved front and a lamp(?). The funnel is green. To the sides the red boiler is outlined with white rivets and yellow body trim and it carries a green, shaped panel and cab name plate "G.T.P." in black text on a yellow background. The bottom sides are in green with yellow, red and white representations of the wheels and driving mechanism. The cab roof is green with a black edge line and printed windows in white on each side of the boiler and cab. The tender is red and carries "527" lettering in black on a yellow, shaped background. It has a dimpled top, painted black, to represent the coal. The rear of the model carries a plain green back to the coal tender. As with most other GTP models this item bears the legend "Made in England" (on the tender body).
The 4 original two part, pressed tin wheels are still on the model , mounted on steel axles with crimped ends.
The baseplate is a single piece, pressed tin unit shaped with a strengthening panel down the centre line. It has been press fitted to the body and held in place by folded tabs in the middle sides. The rear of the tender is also part of this base and it is held by a further folded tab (accessed through the hole in the rear upper surface of the tender) and two rolled edges. The front is held in place by tin, rolled to hold it over the edges of the body. There are no manufacturer's marks or country of origin details on the base.
I do not know exactly when this item was issued but believe it to be between 1950 and 1959. It was also available in the reverse colours of green boiler, cab, and tender with red roof.