Machell of Glasgow introduced the Dulcitone in the early 1860s, and manufacture continued into the twentieth century. There were three models - Type B with 3½ octaves, Type R with 4, and this one - Model F, with 5 octaves. The sound is produced by a piano action striking a row of tuning-forks, so they can never go out of tune. The tone is sweet and gentle, and may remind those of us of a certain age of 'Listen with Mother'.
This one has a mahogany case - they also came in oak - and seems to be in pretty good condition. All the notes work, but a few of the keys are a bit sticky - Cleaning and excercise can usually cure this.