Stamps with Perforated initials are nicknamed Perfins. The process of perforating stamps by companies and government agencies was meant to discourage theft. The perforation of stamps for these purposes disappeared when postage meter stamps became widely available. Below are some example Perfins from the Northeast US.
| Pattern | Entity | Years | City | ST | PreCan |
| AGR | Agric. Dept., Cornell Univ. | 1914- 1922 | Ithaca | NY | |
| ATF/Co | American Type Founders Co. | 1903- 1911 | Boston | MA | |
| BC/Co | J.T. Baker Chemical Co. | 1932- 1935 | Phillipsburg | NJ | |
| BEA/VER | Beaver Board Co. | 1903- 1922 | Buffalo | NY | |
| BFG/Co | B.F. Goodrich Co. | 1898- 1922 | Boston | MA | |
| BM/C | Hatch Music Co. | 1911- 1935 | Boston | MA | |
| BM/C | Boston Music Co. | 1917- 1923 | Boston | MA | yes |
| BOR/DEN | Borden's Farm Product Co. Ltd. | 1922- 1932 | New York | NY | |
| BR | Babson's Report | 1903- 1930 | Wellesley | MA | |
| C(Y)C | CYC Institute of Law | 1902- 1914 | New York | NY | |
| CBTo | Bankers Trust Co. | 1937- 1942 | New York | NY | |
| CH/Co | Crouse Hinds Co. | 1898- 1922 | Syracuse | NY | |
| CLIC | Colonial Life Insur. Co. | 1917- 1938 | Jersey City | NJ | yes |
| CNB | Chase National Bank | 1926- 1935 | New York | NY | |
| CSS/Co | Cunard Steamship Co. | 1912- 1945 | New York | NY | |
| CU in [] | Columbia Univ. | 1917- 1958 | New York | NY | |
| CW | P.F. Collier & Sons | 1911- 1918 | New York | NY | |
| CWS/LTD | Cunard White Star Ltd. | 1912- 1945 | New York | NY | |
| D1 , DM/Co | Dennison Manufact. Co. | 1911- 1945 | Boston | MA | |
| DXN | Joseph Dixon Crucible Co. | 1922- 1928 | Jersey City | NJ | |
| EF | E.F. Houghton Co. | 1914- 1935 | Philadelphia | PA | |
| F (in rhomboid) | E.L. Faber Pencil Co. | 1922- 1928 | Brooklyn | NY | |
| FD (in square) | Fidelity & Casualty Co. of New York | 1935- 1942 | New York | NY | |
| FP/L | Famous Players Lasky | 1914- 1926 | New York | NY | yes |
| GES/Co | G.E. Stecher & Company | 1908- 1926 | New York | NY | yes |
| GINN | Ginn & Co. | 1903- 1911 | New York | NY | |
| GINN | Ginn & Co. Book Publ. | 1913- ? | Boston | NY | |
| GINN | Ginn & Co. | 1932- 1935 | Cambridge | MA | |
| GM/C | General Motors Corp. | 1950- 1962 | New York | NY | |
| GT | Guaranty Trust Co. of NY | 1911- 1935 | New York | NY | |
| H.U. | Harvard Univ. | 1914- 1917 | Cambridge | MA | |
| H/oo/D | Hood Rubber Co. | 1917- 1938 | Boston | MA | yes |
| HE | Home Economics Dept, Cornell University | 1926- 1953 | Ithaca | NY | |
| HPE | Elliott Addressing Machine Co. | 1917- 1938 | Boston | MA | yes |
| IP/CO | Ticonderoga Paper Co. | 1912- 1935 | New York | NY | |
| J&J | Johnson & Johnson | New York | NY | ||
| JH | John Hancock Mutual Life Insur. Co. | 1937- 1942 | Boston | MA | |
| JR/C | Jewett Refrigerator Co. | 1911- 1918 | Buffalo | NY | |
| KF/S | King Features Syndicate | 1922- 1938 | New York | NY | yes |
| LM/MCo | Lanson Monotype Machine Co. | 1898- 1935 | Philadelphia | PA | |
| LVC/Co | Lehigh Valley Coal Co. | 1911- 1918 | Wilkesbarre | PA | |
| M&M | March & McLennan | 1915- 1923 | New York | NY | |
| MA/D | Melchior, Armstrong & Dessau | 1902- 1932 | New York | NY | yes |
| MET/LIFE | Metropolitan Life Insur. Co. | 1911- 1922 | New York | NY | |
| MG | Max Grab Fashion Co. | 1912- 1935 | New York | NY | |
| MLI , MLI/Co | Metropolitan Life Insur. Co. | 1915- 1959 | New York | NY | |
| NLY | New York Life Insur. Co. | 1903- 1972 | New York | NY | |
| NP | Loyal Protective Life Insur. Co. | 1935- 1949 | Boston | MA | |
| NS/C | National Surety Co. | New York | NY | ||
| NY/U | New York Univ. | 1954- 1963 | New York | NY | |
| NYC | NY Central Railway | 1911- 1955 | New York | NY | |
| OP/Co | Ontario Power Co. | 1911- 1928 | Niagara Falls | NY | |
| PP/C | Paramount Pictures Corp | 1918- 1954 | New York | NY | yes |
| PSC | Penn. State College | 1926- 1932 | Harrisburg | PA | |
| RE/Co | Reilly Electrotype Company Incorporated | 1917- 1933 | New York | NY | yes |
| RHW | R.H. White Department Store | 1908- 1911 | Boston | MA | |
| RT&/SCo | R. Tuck & Sons Co. | 1903- 1911 | New York | NY | |
| S (diamond) | Singer Manufac. Co. | 1908- 1940 | Elizabeth | NJ | yes |
| TC | Teachers College, Columbia Univ. | 1926- 1942 | New York | NY | |
| TRAV | Travelers Insurance Co. | 1911- 1923 | New York | NY | |
| TU in [] | Temple Univ. | 1914- 1917 | Philadelphia | PA | |
| U/OF/P | Univ. of Pennsylvania | 1926- 1954 | Philadelphia | PA | |
| US/MC | United Shoe Machinery Co. | 1908- 1940 | Boston | MA | yes |
| USL | U.S. Light & Heat Co. | 1911- 1928 | Niagara Falls | NY | |
| V | Vitaphone Corp. | 1912- 1929 | New York | NY | |
| W/Co | White Motor Co. (W61) | 1926- 1933 | New York | NY | yes |
| WB | W. Atlee Burpee Seed Co. | 1922- 1928 | Philadelphia | PA |
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