The following information may be of interest, if not of definitive help to you. My interpretation of the British insurance policy excerpt below, is that your razor may well have been manufactured prior to 1850 and sold by Buck, if not actually manufactured by Buck. According to Judge Henry Lummus in "Old Sheffield Razors", almost all of the 19th century razors manufactured in England, regardless of the city name stamped on the blade, were actually made in Sheffield. The research was interesting..thanks for your question.
Regards,
Croaker
Department of Libraries, Archives and Guildhall Art Gallery
GUILDHALL LIBRARY MANUSCRIPTS SECTION
NEWSLETTER
Issue No. 10 Winter 2007/8
Email: manuscripts.guildhall@cityoflondon.gov.uk
Website: www.history.ac.uk/gh/
Another of the Buck family is recorded in policy number 1187028 (Ms 11936/542) on 5 November 1834 as ‘Joseph Buck of No 245 Tottenham Court Road, Saw, Plane File and Tool Maker’. This Buck did not actually make any tools, but mainly sharpened saws and did repairs to the varied and wide range of tools he stocked. Many of the iron planes that I am researching are marked with Buck’s address in Tottenham Court Road, although these were not made by him. By looking a bit deeper into the Sun insurance records I was able to find out a bit more. In an endorsement book entry dated 20 September 1854, the firm is recorded as J. Buck now George Buck of 245 Tottenham Court Road (Ms 12160/129 page 446, policy number 1187028).