"H" Perf. 11.2 x 11.2
"L" Perf. 11 x 11
"EL" Perf. 10.5 x11.25
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"H" Perf. 11.2 x 11.2 |
"L" Perf. 11 x 11 |
"EL" Perf. 10.5 x11.25 |
There are 3 major types of perforations.
L or l = L perforation - perforated in row stage operation. This is in the shape of an "L". It's characterized by overlapping holes. All margins are perforated through. P-11x11, (exactly 10.94x10.94).
EL or el = Electric Eye Perforation: "L" type margins are not perforated completely through. P-11x10.5, (exactly 11.25x10.5).
H or h = Horrow Type Perforation: also called "on press", "in line", "bullseye" perforation. Characterized by perfectly intersecting holes. P-11.2 x11 (Exact (11.25x11.25).
| 1580 | (EL),L,H | 1844 | (L) PL. #1 | 1894 DG | (L) |
| 1596 | (L),H | 1844 | (L) PL. #2 | 1951 | (EL) |
| 1622 | HUCKPRESS | 1844c | (EL) | 1951a | H |
| 1622c | (Giori Press) | 1862 | (L),H | 1953-02a | EL,(H) |
| 1711 | (H),L | 1863 | L ,H | 2535 | EL, H = P-13 |
| 1735 | (L),H | 1864 | (L),H | C98 | H |
| 1789 | (P-11) | 1867 | (L),H | C98a | (EL) |
| 1789 | P-11 x 12 | 1868 | (L),H | C108 | H |
| 1795-98a | (H),EL | 1869 | (L),H | C108a | (L) |
| 1844 | H | 1894 SG | H | C128 | H, (L) |
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