Perforations on the 1967-1973 Centennial Issue
There are three attributes of perforations that are of interest here:
- Whether the perforations are line perforations or comb perforations.
- What the measurement of the perforations are (i.e. the gauge), and whether there is any significant and consistent variation to be found.
- Whether the perforations extend all the way through the selvage of the sheets, stop at the outer margins of the stamps, or extend 1 or more holes beyond the stamps, but not all the way through the selvage (called extension holes).
The above picture shows a plate 1 block of the 1c brown from the upper left corner of the sheet. This block is line perforated. Line perforating is where each row and each column is perforated separately by feeding the sheet through the perforator in one direction first, and then in the other direction. In the case of very early issues each row or column was done individually, and the lines were often not straight, which is why well centered examples of early Canadian stamps are so scarce. However, by the time this issue was printed, it would appear that fewer passes through the perforator were required. However, it would appear that the number was more than 2, because sheets are often encountered in which the alignment of the perforations within the margins does vary, and a single pass through the perforator should, if all the stamps are evenly spaced apart, produce the same degree of alignment within those margins.
Because the vertical perforations and horizontal perforations are not done simultaneously, they will often be double punched where the rows and columns intersect, rather than terminating perfectly at the corners. Notice on this block how the perforations do not terminate in a single hole wherever a row and a column of perforations meet, but instead there are double punched holes. That is the most fundamental characteristic that enables one to tell if a stamp is line perforated. But what about single stamps? Well, the corners of single stamps will appear uneven, and if you take two line perforated single stamps and lay them on top of one another, they will not meet up perfectly, except in rare cases, even though the perforation measurements themselves may be the same.
Now let's look at comb perforating.
- 11.95 x 11.95
- 11.95 x 11.85
- 11.85 x 11.95
- 11.85 x 11.85
These two blocks are both printed on dull fluorescent paper. The plate 3 block on the left is perforated 11.85 x 11.95, while the plate 2 block is perforated 11.95 x 11.95.
Here is a block printed from plate 4, which is perforated 11.85 x 11.85:
Here is a plate 5 block in the reddish brown shade with PVA gum:
- A 25c booklet consisting of two panes of 5 of the 1c and 4c stamps, issued February 8, 1967.
- A 25c booklet consisting of a pane of 5 5c stamps, issued February 8, 1967.
- A 20c booklet consisting of a pane of 4 2c stamps and 4 3c stamps, issued October 1970.
- 10, which was used for some of the early booklet stamps, and the first printings of the 6c orange sheet stamp, and,
- 12.5 x 12, which was used for the 6c black sheet stamps, the 7c, 8c parliament sheet stamps and most of the booklets produced after 1969.
- 1c and 4c stamps that came from a 25c booklet that was issued in September 1968.
- 1c and 6c orange stamps that came from a 25c booklet issued in October 1968.
- 4c stamps that were issued in $1 booklets of 25 stamps in January 1968.
- 5c blue stamps that were issued in a $1 booklet containing 20 stamps in August 1968.
- 6c orange sheet stamps and stamps issued in booklets of 25 in November 1968.
- 6c black die 1 stamps that were issued in booklets of 25 in January 1970.
- 6c black die 2 stamps that were issued in 25c booklets of 4 in May 1970.
- All of the booklets containing 7c, 3c or 8c stamps and all the 1c and 6c stamps that come from those booklets.
- The 6c orange sheet stamps issued in March 1969.
- The 6c black die 1 and 2 sheet stamps that were issued between January 7, 1970 and April 1970.
- The 6c black die 1 booklet stamps that were issued in panes of 25, in December 1970.
- The 7c emerald green sheet stamps, issued June 30, 1971.
- The 8c slate sheet stamps, first issued December 30, 1971.