Is This A Joint Line Pair ?

That is called a "trailer tab".
Comes from a larger coil roll....helps the stamps to be started
to rolled in the circle.
A piece (wrapper) of paper on the other end
is a "leader tab". It wraps the roll and usually has markings on it.
It will state the demonination and roll size.

I realize the tab but I question the fact there are 2 red lines in the joining area of the stamps. Excuse the scan it makes it look wavey but rest assured the lines are there and are straight one on the perfs one on just paper.

The line is just ink build up between plates.
Just not being a solid line is OK....it happens.

These four pages were extremely interesting to me, because I collect coils exclusively. As I understand it, the "Guide Lines" are really not found on newer stamps ( read coils ), but the "joint lines" are. Some thirty years ago, when the first Transportation coils appeared sometimes those "joint lines" were referred to as "Cottrell lines" after the presses they were printed on.
I do not want to murken the waters here, but when the BEP were still printing coils the printers called the "joint lines" seam lines.
Even though the BEP does not print stamps any more, "seam lines" are still found on some coils.

Peter

Does anyone know about when the US Postal stopped producing coil stamps with lines on perfs whereby one could collect joint line pairs?
I think most of the transportation stamps had them but not sure afterwards?

Acanalizo, the coil stamps that had joint lines ( also called seam lines by BEP printers ) were caused by the fact that two plates were used for every revolution of the Cottrell press. Where the plates met was a tiny space between the plates. Ink would deposit in this space which in turn would cause the line. The Cottrells were only used for 17 transportation coils, the rest did not have a joint/seam line.
Several of the newer stamps ( no longer printed by the BEP ) do show a seam line, that is not nearly as easy to see as the Cottrell lines. They come in one or more colors per issue.
So the short answer to your question is that "joint" or "seam" lines are still printed on stamps produced by some printers!

Peter

This may not be totally accurate, but in perusing the Scott Catalog, I find the last listing for a coil line pair was on Scott #1947 -- the "C" Eagle Domestic Mail Coil issued in 1981. Everything thereafter (including the Transportation Coils) were all assigned plate numbers and were collected as plate number coils.

Thank you, very helpful. I have been looking for a long time for joint line pairs of some transportation series coils that may not exist at all from what you say. I just assumed all of the transportation series had them. Could you or someone give me a few examples on modern coils by Scott # that contains these lines. Thank you,

Wt1, I do not know what exactly you mean by "this may not be totally accurate". I guess you are referring to Scott?
The last Scott I bought was in 1987. They were so terribly 'unspecialized' that I quit getting it!
If my research is correct, the last true joint line on the Transportation Coils was on the 8.3 cent Ambulance that was issued on 21 June 1985. ( Both the tagged and the precancelled stamps ). Scott number for those two stamps were 2128 and 2128a. Before the Cottrells were taken down in November of '85 they printed other stamps, but the Ambulance is the last 'new' issue that has joint lines ( "Cottrell lines" ).

Peter

Acanalizo, In the thread above to Wt1 I mentioned the last Transportation Coil to have the joint line. If you would like a complete list of Transportation Coils that have joint lines, I can get you that list. Another way of getting that info is to go to the PNC3 website, www.pnc3.org but you would have to research the list yourself.
As for a modern coil that has seam lines, the latest one would be the Star Spangled Banner issue of this year. On the stamps from a roll with plate number S11111 there is a seam line between position 2L and 1L. ( Position 1L is the stamp with the plate number, pos. 2l is the one to the left of it. Pos. 1R would be the stamp to the right of the plate numbered stamp and so forth! ).
There is a second seam line on this issue, found approximately halfway between the plate numbered stamps!
I do not know the exact Scott number for the S11111 stamp, but it is either 4853, 4854 or 4855.
I forgot to mention that the seam line on this issue is harder to see than normal; it is black!

Peter

I may have been misreading what the initial question was, but my previous comments referred to the last "coil line pair" that was collected with the traditional two stamps (i.e. pair). The Transportation Series and those stamps that followed may have very well had some issues with lines, but they all were printed with plate numbers and most collectors chose to acquire plate number coils of 3 (and later plate number coils of 5) for those issues.

Also, I picked up the comments previously made from reviewing my 2013 Scott Catalog. Again, I'm not sure it is totally accurate, but it would seem so based on my initial review of those details.

By the way, the 2014 Star Spangled Banner Coil Stamp issued by SSP was Scott No. 4868. (The earlier Star Spangled Banner Coils, Scott 4853 was printed by CCL and 4854 was printed by APU).

Sorry about the number; I did not know. I got the numbers off the Virtual Stamp Club's website. Personally, I use the catalog numbers that the PNC club ( PNC3 ) gives them; the SSP Star Spangled Banner would be 2014-7! But I do know that some collectors still collect joint line pairs, even though Scott does not list them any longer. Scott also does not list tagging breaks on coils, and people collect those. Likewise with precancel gaps. Scott is woefully inadequate when it comes to specializing. Just look at the fact that they listed Plate Strips of 3 ( PS3 ) long after collectors abandoned strips of three in favor of strips of five ( PS5 ) or longer!

Peter

Folks, joint lines were on engraved issues, seam lines are on offsetr printed issues.