Today, I began my examination of the stamps of the 1970's with the first 10 stamps of 1970. This is one of the supposedly simpler periods according to Unitrade, with no varieties other than the basic Winnipeg tagged versions of the commemoratives being listed.
In contrast to the previous two years, in which most of the stamps are printed on fluorescent papers, this is the first time in two years that the vast majority of the 10 stamps are printed on dull fluorescent papers, with only one issue being issued on high fluorescent paper. Despite the relatively simple appearance, it turns out that most of the issues have upwards of 6 different varieties of dull fluorescent paper. There are also the usual variations in perforation on the CBN printed stamps. When these two factors are combined, there is quite a bit more collecting scope than one would expect at first glance.
There are not really much shade varieties to collect, nor are there any constant varieties known at the current time. However, there are a couple of different ink varieties, which only show under UV light, and there could be more - it is really a matter of diligently studying this material in greater depth, and seeing what turns up.
The higher value Expo 70 issue and the United Nations issue have some interesting paper and tagging varieties, not to mention the 21 different se-tenant combinations that can be collected. One very challenging aspect to these stamps is the better postal history, with proper, commercial usages of the 10c, 15c and 25c stamps being quite difficult to find. Also, the Winnipeg tagged stamps are greatly underestimated in Unitrade, especially in commercially used condition, as generally less than 2% of all issued stamps were tagged.
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