The 6c Orange Transportation Stamp of the 1967-1973 Centennial Issue Part Two
Today's post will get into the remaining printings of the sheet stamps of the 6c orange transportation design. This is an interesting stamp because it proved to be wholly unsuitable for the mail sorting machines that the post office was introducing. Collectors who spend a significant amount of time with this issue will note that the Winnipeg tagging is often very difficult to see on these stamps, even under UV light. This is one of the reasons why the orange colour was dropped and replaced with black in early 1970. Last week I looked at the very first printings of the sheet stamps, which were comb perforated 10. This week, I will explore the later printings of the untagged stamps, which were comb perforated 12.5 x 12, and the tagged stamps that were issued in both perforations. Unlike the perf. 10 stamps that I looked at last week, there are no known fluorescent orange ink varieties known on either the perf. 12.5 x 12 untagged stamps, or the Winnipeg tagged stamps. However, the