A rare Blackbee’s speculum introduced by him in 1871. It is unusual to find one of these with the original wooden ring. This ring was used to constrict the “blades” of the wire frame during insertion into a cylindrical shape.
When in position in the vagina the wooden ring would be pulled back and the metal frame would expand back into its resting expanded state. In America this was called Blakeley’s Resilient Speculum as illustrated on p 433 of Tiemann’s American Armamentarium Chirurgical . This however is an English example.