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1) KAMPF perforation |
2) APS perforation (upright print) |
3) APS perforation (inverted print) |
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Until 1974 sheets were generally perforated in ‘lifts’ (several sheets in one operation). These perforators were known as Comb or KAMPF perforators, they were gradually superseded by the rotary (APS) perforator, this machine perforates in the reel as the stamps are printed. The rotary perforator pierces the paper as it is fed through the reel, this leaves a residue of paper and gum on one side of the hole. By studying this residue you can determine which way round the sheets were fed into the reel. The APS illustrations above portray which way round the sheets were fed into the reel. In the first illustration, the paper residue is at the bottom of the punched holes, this denotes an upright printed stamp. In the second illustration the paper residue is at the top of the punched holes, this denotes an inverted print stamp. This is the easiest way of identifying an APS perforated stamp for direction of print (see below). | ||
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Residue at left of holes. |
Stamp is sideways print right |
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Residue at right of holes. |
Stamp is sideways print left |
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Residue at bottom of holes. |
Generally stamp is upright print |
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Residue at top of hole. |
Generally stamp is inverted print |
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The Kampf perforator produces cleaner edges to the holes than the APS perforator but is prone to leaving the punched part of the paper attached. Comb perforators are similar to Kampf but produce cleaner cut holes. Click here to view illustrations of sheet fed low value perforator types | |
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Sheets perforated from the gummed side There have been instances when sheets have been perforated from the gummed side of the stamp in error (See the Questa 2p and 5p litho low values section of the web site). | |
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Blind at base perforations occur on Walsall booklet panes perforated on the Bickel (Comb) sheet fed perforator, the pins did not perforate to the bottom of the sheet, hence the bottom perforation on the bottom row of stamps of the sheet is always omitted. | |
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Copyright (c) 2008 Denis Stevens. All rights reserved | |
