The below gallery displays very early NTR sales leaflets, two from 1912 and a third from 1913. Images sourced from Grace’s Guide:
An interesting flier from a company called ‘The Time Recorder Supply & Maintenance Company’, published around 1930. It states the company’s date of establishment as 1910, advertising that it supplies a variety of British-made time recorders. From the descriptions given, these all appear to be NTR models:
An independent company’s sales leaflet from around 1940, which includes pictures of NTR clocks:
A 1935 letter from Time Recorders (Leeds) Ltd in to one of their customers, regarding the sale of NTR clocks: