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How to identify a Flat and Rotary Plate printing
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Ken Wilson
Jul 15, 2001, 10:21:51 AM7/15/01
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How do you identity which printing process was used to print a stamp - Flat
Plate and Rotary Plate Printing? On both a mint and used stamp?
Plate and Rotary Plate Printing? On both a mint and used stamp?
Thanks
Edward Stamm
Jul 15, 2001, 10:44:11 AM7/15/01
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The design of a Rotary Press printing is either slightly wider or slightly
higher than that of a Flat Plate printing. One technique I use is to take a
known Flat Plate stamp (and one of little value) and cut all four corners off.
Then, you can put this stamp over the top of another stamp in queston. If the
design of the unknown stamp is the same size as the cut one on top, then you
have a Flat Plate stamp. If the design is either wider or higher than the cut
one, then you have a rotary press stamp.
higher than that of a Flat Plate printing. One technique I use is to take a
known Flat Plate stamp (and one of little value) and cut all four corners off.
Then, you can put this stamp over the top of another stamp in queston. If the
design of the unknown stamp is the same size as the cut one on top, then you
have a Flat Plate stamp. If the design is either wider or higher than the cut
one, then you have a rotary press stamp.
There are a few cases where the gum on a mint stamp can indicate whether a
stamp is flat plate or rotary, but this is certainly not a good way to do it.
R.I. Mateles
Jul 15, 2001, 4:33:54 PM7/15/01
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There is a slight size difference. The easiest method is to use a
PHIL-A-METER gauge, obtainable for about $3-4 from Subway Stamp Shop. In
addition to a rotary vs. flat template, it includes a perf gauge and a scale
incremented in 0.25 mm convenient for all sorts of philatelic measurements.
PHIL-A-METER gauge, obtainable for about $3-4 from Subway Stamp Shop. In
addition to a rotary vs. flat template, it includes a perf gauge and a scale
incremented in 0.25 mm convenient for all sorts of philatelic measurements.
Rich Mateles
"Ken Wilson" <kwwi...@mn.uswest.net> wrote in message
news:3Gh47.928$X6.7...@typhoon.mn.mediaone.net...
nospam
Jul 15, 2001, 6:09:18 PM7/15/01
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To identify the printing type you have to know some basics on these
printing methods.
Flat plate printing is the printing of a stamp from a plate that is
flat, as the word says.
For rotary press printing you have to imagine the same plate folded
around a turning cylinder. When you do this, the stamp images will
stretch a little by the bending process.
That is why the images of rotary press printings are either taller or
wider than the flat plate printed stamp.
To identify the printing types you can measure them, but easier is to
take a flat plate stamp (331) that is damaged and cut of little cubes
from the corner so that the stamp now looks like a cross.
When you put this stamp on top of the stamp you want to check, you can
position it exactly over it. If it is a rotary printed stamps you will
notice it does not fit because the stamp you check is larger or wider.
printing methods.
Flat plate printing is the printing of a stamp from a plate that is
flat, as the word says.
For rotary press printing you have to imagine the same plate folded
around a turning cylinder. When you do this, the stamp images will
stretch a little by the bending process.
That is why the images of rotary press printings are either taller or
wider than the flat plate printed stamp.
To identify the printing types you can measure them, but easier is to
take a flat plate stamp (331) that is damaged and cut of little cubes
from the corner so that the stamp now looks like a cross.
When you put this stamp on top of the stamp you want to check, you can
position it exactly over it. If it is a rotary printed stamps you will
notice it does not fit because the stamp you check is larger or wider.
Have fun,
Erik
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