'Rosebud Kitmaster' was the name of a range of plastic Model Railway kits produced in the UK by the Rosebud doll company under the name 'Rosebud Kitmaster Limited', from 1959 until 1962. The range consisted of 34 kits of locomotives & carriages in OO, HO and TT scales.
Due to financial problems, they sold the existing stock and tools to Airfix Products Ltd. in 1963. Airfix reintroduced some of the British Locomotives with some slight modifications but the coaches and the Continental Locomotives were not re-issued. Some of the locomotives, from the same tools, are still available today under the Dapol name.
What's it worth? Take a look at this Rosebud Kitmaster price guide: sold listings for a value indication.