Title: G.B. - London 1891 (Dec 17) Description: Page bearing proof impressions in red of 26 differing squared circle or square boxed London E.C datestamps including two rare experimental types (possibly machines), one with a broken middle circle (Stitt Dibden type SD6), the other two broken circles and "59" within horizontal side bars (Stitt Dibden SD3).  A unique page, part of which is illustrated on page 8 of Stanley Cohen's book on London squared circles. Delivery option: Collection & Delivery Category: Collectables