Q: What is the value of a portable wind-up gramophone I have? It is like a small suitcase and the lid opens to reveal the turntable. In the lid is a chrome horn. The machine is called the Decca 33. It is in nice condition and still plays records.

A. This model was produced in the late 1920s and early 1930s, one of a host of such machines made by Decca and other companies such as His Masters Voice and Columbia. Decca continued to make wind-up gramophones until the late 1950s, long after electric gramophones were established. The model you describe is worth about £75-£85 but similar models by HMV are more collected because of their higher quality, and can top £100-£125. Most gramophones of this type had a black leathercloth finish, so examples in red, blue, green and beige fetch a premium price because they look more attractive and were made in fewer numbers.