Waltham “own label” movements are very rare in UK – I have only seen them for Russell of Liverpool and Preston’s of Bolton, but they are somewhat more common in the USA. They come in two varieties. The first have different specifications to mainstream models, such as this 1908-641 branded the Preston’s senior which appears to be a 1908-PSB with the addition of a double roller.
|Waltham 1908-635 The "Russell Model"|
The second more common own label, is a standard model with engraving added to brand them as “own Label" The Preston's junior is of this type as is the Russell model above which includes the Waltham name on the movement and this 1899-630 marked for jewellers Harry A Dillon of Gloversville New York but without the Waltham name although in this case Waltham is on the dial.