The AGR initials, usually seen with dots in between as A·G·R, are the registered sponsor’s mark of Robert Pringle & Sons, one of the UK’s largest wholesalers of jewellery, silverware, clocks and watches at 40 to 42 Clerkenwell Road, London. The mark was entered by Arthur George Rendell, an employee of Robert Pringle & Sons.

A G Rendell’s sponsors mark was first registered with the London Assay Office on 25 June 1907. This was in consequence of the 1907 Act “Assay of Imported Watch-Cases (Existing Stocks Exemption)” which came into force on 1 June 1907 and required all watches imported after that date to be assayed and hallmarked in a UK assay office.

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