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This model is the Mikansue #10 Triumph 1800 Roadster (1947) kit in bare metal. This is from the Standard Range of kits issued by Mike and Sue Richardson under the brand name Mikansue between 1973 and 1989.
The model has not been assembled and examination of the component parts shows no opening features. It is based on the style of the Dinky Toys of the 1940s and 1950s. The car is comprised of two main castings, the main body, and the base and interior. A number of other smaller cast components and a clear windscreen are also included. There appears to be no instructions on how the kit is to be assembled.
At the front, the grille and bonnet emblem/radiator cap are cast into the main body, as are the windscreen wipers. At the sides the doors, door handles, bonnet side flaps and front and rear mudguards are also cast into the body, and at the rear is a cast number plate and boot lid. On the top of the open top vehicle can be seen the cast tonneau.
The bumpers are part of the base casting which also incorporates the bench style seat for the interior. The base is unmarked in any way. The windscreen frame, head lights, steering wheel, and exhaust system all have to be separately fitted to the model.
All wheels are of a shaped cast metal type - solid one piece cast metal hubs, each with a black rubber tyre, mounted on copper axles.
I do not know when this model was first issued but think it was an early release from the 1970s that has only been opened once, in 2019, in order to photograph the components.