Trade Marks are an important in the unambiguous identification of a particular maker. With backsaws especially, the trade mark is usually stamped on the back of the saw and so provides a permanent method of identification.
This list of trade marks is taken from Kellys 1901 trade directory. I will add others here are they become available.
Allen Edgar & Co. Limited, Imperial steel works Tinsley.
Brittain S. S. & Co St George's Works Shoreham Street
 Brooksbank Abram & Co. Malinda Street
 Atkinson Brothers Limited, Milton Works,
Beardshaw J. & Son, Ltd Baltic steel works, Effingham road,
Beckett Alfred & Sons, Ltd, Brooklyn works, Green Lane,
Bedford John & Sons Limited Lion works, Mowbray street,
Burys & Co. Lim. Regent Works, Penistone road & Philadelphia works Rutland road. Other Marks: "WM.ASH & Co.", "REGENT"
 Colquhoun & Cadman, Douglas works, Arundel Street
 Carr J. & Riley, Bailey Lane works,
 Colver Bros. Lim. Pilot works, Cotton Mill row
 Cook Williams & Sons, Glasgow Steel and File Works Washford road, Attercliffe; and Glasgow and London,
 Drabble & Sanderson, Ebenezer Works, Morpeth St.
 Firth Thos. & Sons, Ld. Norfolk Works, Savile street east,
 Flather W. T. Limited, Standard steel works, Love street.
 Glauert L. & C. Wallace works, Furnival Street,
 Hansell F. L. & Co The Hansell Canal Steel and Wheel works, 47 Eyre Lane,
 Hearnshaw Brothers 50-52 Sorby Street,
 Howarth James & Sons, Bath Street
 Ibbotson Brothers & Co Lim. Globe Steel works, Alma St; and 7 Victoria Street, Westminister, London, s.w
 Jackson William & Co Sheaf Island works Pond hill,
 John Wilson, Marsden Bros. & Co. Portland works, Trafalgar street
 Kenyon John & Co. Mill Sands steel works, Mill Sands,
 Lockwood Bros. Limited, Spital Hill works, Spital hill.
 Makin Thomas & Son, Castle works 105 Edward street,
 Marples William & Sons Limited, Hibernia Works, Westfield terrace.
 Marsden & Beeten, Middlesex works, Newcastle st.
 Moss & Gamble Bros. Franklin works, Russell street; & Wadsley Bridge works, Wadsley Bridge,
 Newbould Samuel & Co. Lim. Newhall road,
 Osbaldiston Louis & Co. Challenge works, Arundel street,
 Osborn Samuel & Co. Clyde steel and iron works, Wicker; 184 Brook hill, Blonk street and Rutland works, Penistone road; and London,
 Peace Joseph & Co. Lim. Lancaster street,
 Peace W. K & C. Limited, Eagle works, Mowbray street; London offices 61 St. Mary Axe, E C.
 Pearson F. G. & Co. Hope Works, Furnace hill.
 Warranted Superior Priest & Co. Pea Croft brass works, 60 Solly street. While not strictly a saw maker, this medallion appears on many secondary product lines.
 Russell, Horsefield & White; Canada works, Charles street,
 Sanderson Bros. & Co. Lim. Newhall road,
 Slack, Sellars & Co. Townhead works, Lancaster street, Neepsend
 Sorby I. (now Turner, Naylor & Co Ltd), John street
 Sorby Robert & Sons Ltd. Trafalgar street.
 Spear and Jackson, Etna works, Saville street east,
 Sybry, Searls & Co. Carlisle street
 Taylor Brothers. Adelaide works, Mowbray street.
 Turner, Naylor & Co. Ltd. (late I Sorby), Northern tool works, John street.
 Turner Thomas & Co. Suffolk works, Suffolk road
 Turton Bros & Matthews Lim. Steel, file & spring works, Wentworth street, Neepsend lane; and 34 Gracechurch street, London E C, N.T. No 1045 T.A. "Matthews Sheffield"
 Tyzack Joseph & Son Lim. Meersbrook, Sheffield
 Tyzack, Sons & Turner, Little London works, Heeley
 Tyzack W. A. & Co. Stella works, Hereford street
 Ward & Payne, Ward's works, West street & Limbrick works, Hillsboro,
 Wheatman & Smith Ltd. Russell works, Kelham Island,
 Wilson, Hawksworth, Ellison & Co. (now Kayser, Ellison & Co. Ltd.), Carlisle wrks.
 Wilson William F. H. Hermitage lane
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