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The 4c Seaway Lock Stamp of the 1967-1973 Centennial Issue Part Three

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This week's post will examine the booklet stamps, miniature pane stamps and coil stamps of the 4c seaway lock stamp from this issue. Unitrade and McCann differ slightly in terms of the fluorescent paper varieties that they list for the booklet stamps, but otherwise, they are fairly close in terms of their listings. McCann does list two plate flaws on the BABN booklets, that are not listed in Unitrade, and these are described in this post.

The coils are listed by Unitrade as having all the usual varieties associated with CBN printed coils, such as jump strips, cutting guideline strips and repair paste-ups. However, in addition, there are narrow and wide spacing strips that exist. Unitrade notes the existence of these, but does not list them. Unitrade also lists two basic paper types: DF and LF-fl. However, as we shall see, there are several different types of paper, shade and gum on the coil stamps. So that it is possible to build a considerable amount of scope into a collection o…

The 4c Seaway Lock Stamp of the 1967-1973 Centennial Issue Part Two

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This week, I will examine the tagged sheet stamps of the 4c seaway lock stamp. While not quite as complicated as the untagged stamps, there are quite a few varieties of paper, shade and perforation that are not listed in Unitrade. Unitrade lists four basic varieties of this stamp, which they expand to six listings when paper fluorescence varieties are added:


The Winnipeg 1-bar tags, which were in use from February 8, 1967 until the change in postal rates in 1968 necessitated the introduction of centre bar tagging. Unitrade lists them on dull fluorescent (DF) and non-fluorescent (NF) papers. The Winnipeg centre bar tagged stamps with dextrose gum. These were first issued in March 1969, several months after the postal rate changes that took effect in 1968. Unitrade only lists these on DF paper.The Winnipeg centre bar tagged stamps with PVA gum. These were first issued in May 1972, and are listed on both low fluorescent (LF) and medium fluorescent (MF) paper. The MF paper is quite scarce…