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Depending on the kind of printing the reproduction process from one stamp design to a full printing sheet may vary. All printing methods involved in the 1935-1959 period rely heavily on the photographical reproduction techniques. We can expect that all stamps of a printing sheet have the same design basically - the design of the original project. In the offset-litho method we have established that coming from one single stamp design to a root block of 5x2 or 5x5 is the way the Casa de Moneda used to follow. The root block got reproduced several times in order to get a pane of 10x10 or 20x10 and several panes got reproduced into a complete printing sheet. During a long career of a particular definitive stamp the design may get modified somewhat. We speak of different "types" if we can actually point out to the changes made and the various "types" normally are each others successors. Not always! When dealing with the above step by step reproduction the particular type will be present all over the printing sheet. During the first step on the way to the root block several minute characteristics may have crept in - not on purpose - but still! Each stamp of a root block may have one or more characteristics that will be found on quite a lot of positions in the printing sheet. A printing sheet of 400 may have 40 of the same [5x2 root block] or 16 [5x5 root block]. We can not call them "plate flaws"! Plate flaws can only occur on ONE particular position of the printing sheet, never on more!The characteristics of the root block are call "systematical flaws". Systematical flaws will occur both in the stamps made by offset-litho and in those in typography. But in typography there was a short period when use was made of loose stereotypes [several single "stamps" bound together in a pane of 10x10 or 20x10] and these stereotypes got changed regularly or reproduced themselves and during the reproduction / copying a minute characteristic could have crept in! We only find this for the 5c Moreno and the 10c Rivadavia; we rather call them different "types" as well as they can be spread all over the printing sheet in an irregular way and not all the time in the same manner... I will deal with these types later on - the 5c Moreno having type II and III irregularly mixed up in ONE printing sheet and the 10c Rivadavia type II and III just the same! |
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In a special section of the book called "Variedades por defectos de Impresion y Retoques" the plate flaws and the systematical flaws have not been separated. It may even be so that the writer has not realized that he might have made that distinction. A great pity as recently one of the Foreros has published a great article on the root block of the 50c Petroleo in Revista! And the 50c Petroleo with the dot behind the word "Mar" is NOT a plate flaw but a systematical that will appear several times in a bundle of the 50c. The frequency - depending on the right period and type of paper - will be close to 10%! |
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[quote="patagonian"02 Oct 2010 00:56 ][color=#000080]I think you should consider write your own book... :wink: [/color][/quote] Nestor, thanks for the compliments but I think I need the help of Foreros here as well! You can not simply ignore excellent studies as I said in my previous postings!
Thank you Educ! |
