A young William French working. Date Unknown.
The firm was founded in 1900 by Douglas Glendining, previously at Lloyd’s. He first dealt in medals before expanding into numismatics. Upon his retirement in 1948, the business was transferred to Phillips, Son and Neale, an arts auctioneer under the management of William French. French would go on to manage the firm until his death in 1986, by which time he was considered one of the finest auctioneers in numismatic history. Glendining's failed to thrive following his death, and the brand was acquired by Bonham’s. In its heyday, Glendinin's would auction a number of important collections, including those of Ryan, Platt Hall, Lockett, Rashleigh among others.
Biblio: John Spring, Ancient Coins Auction Catalogues 1880-1980, London 2009 (image and description)