1- SCOVILL MF'G CO WATERBURY (back ungilted) WWI (1850-1865 backmark)
2- SCOVILL MF'G CO WATERBURY WWI (1850-1865 backmark)
3- SCOVILL MF'G CO. * WATERBURY * 1902-1918 (1870s-? backmark)
4- SCOVILL MF'G CO. WATERBURY CT. WWI (1870s-? backmark)
5- SCOVILL M'FG CO. WATERBURY (ring of dots) 1902 (1860-1880 backmark)
6- WATERBURY BUTTON CO. * 1849-1965
7- WATERBURY BUTTON CO. *CONN.* pre 1965
8- WATERBURY COS INC CONN post 1965
9- W W W W (waterbury) modern
10- W.B. CO.
11- CITY BUTTON WORKS - N.Y.- WWI (Erlanger & Liebmann),
12- CITY BUTTON WORKS- NEW YORK- 1877-1923
13- US PRODUCTS CORP
14- R. LIEBMANN MFG CO WWI
15 R. LIEBMANN MFG. CO.-NEWARK NJ- WWI-?
16- R.L. MFG Co Newark N.J. WWI-?
17- THE AUSTIN CO. PROVIDENCE R.I.
18- HORSTMANN *** PHILA *** 1893-1935
19- ARNSTEIN SIMON & CO. * S.F. * WWI
20- N.S. MEYERS * NEW YORK * 1906-2000 (in business in NY)
21- AMERICAN BUTTON CO. *NEWARK N.J.* 1901-1920
22- AM. BUTTON CO *NEWARK, N.J.* 1902-1917
23- AMERICAN EMBLEM CO. UTICA N.Y. WWI
24- UNIQUE ART MFG CO. NEWARK, N. J.
25- THE ART METAL WORKS, NEWARK, N.J.
26- ART METAL WORKS INC -NEWARK, N.J.- 1900-1930 approx.
27- METAL SPECIALTIES Co. ATTLESBURG, MASS. 1940-1945 (painted black)
28- CHAS. FISCHER SPG. CO. NEW YORK WWII?
29- * SUPERIOR QUALITY *
30- GREENWOOD CO * DETROIT MICH *
31- COL BUT WKS RUTHERFORD N.J. WWI
32- COLUMBIA BUTTON WKS*RUTHERFORD,N.J.* WWI
33- NEW YORK BUTTON WORKS WWI (found in France)
34- S & J WATERBURY CT. WWI (found in France)
35- STEELE & JOHNSON * WATERBURY CT * WWI (found in France)
36- JEWELERS PRODUCTS CORP. PROV. R.I. WWI (found in France)
37- SUPREME 172 QUALITY
38- REX PRODUCTS CORP * NEW ROCHELLE, N.Y. * 1902-WWII
39- D. EVANS & CO. * NO. ATTLEBORO, MASS. 1848-1945
40- D. EVANS & CO. N.A. WWI (found in France)
41- D. EVANS & CO ATTLEBORO FALLS WWI
42- * SUPERIOR QUALITY *
43- MADE IN ENGLAND (anodized aluminum front)
44- S. EISENER CO. RED BANK N.J. WWI (in business1859-1925)
45- SIGMUND EISNER RED BANK N.J WWI " " " "
46- Art in Buttons U S U. S. A. (vegetable ivory)
47- ? N.Y. (pressed vegetable ivory) war years
48- C KENYON CO. NEW YORK WWI- 1930
49- BROOKS.BROTHERS *NEW YORK* ENGLAND 1902-1910.
50- L.A. MYERS. JR. INC. NEWARK N.J.
51- H.V. ALLIEN & CO. NEW YORK
52- DUSENBURY & SCHWAB INC. NEW YORK 229 4TH AVE.
53- LUXENBERG NEW YORK MADE IN ENGLAND
54- ROSENFIELD & RAPKIN * BOSTON, MASS.
55- WARNOCK UNIFORM CO *NEW YORK* (made from horn)
56- G J & F PARIS
57- H W I SCHWAB INC NEW YORK
58- THE J.E. MERGOTT CO. NEWARK, N. J.
59- JAMES C. DORAN & SONS PROVIDENCE R.I.
60- CORD 22
61- TIFFANY & CO. MAKERS ** M ** (14K gold blazer) 1907-1947
62- JACOB REED'S SONS * PHILA. * in business 1880-1983
63- A M & Co. 23 M PARIS
64- S.N. MEYER WASHINGTON D.C. in business 1890-1925
65- BADGER MFG. CO. RACINE, WI.
Another backmark for the list. This appears to be the best list you will find online for Great Seal button backmarks. Many still to add.
http://forum.treasurenet.com/index.php/topic,310425.0/topicseen.html