Center On Center Coil Stamp Collecting

Just asking if anyone collects center on center coil stamps? To me it is unique to coil stamps of the past 30 years with the proliferation of self-adhesive coils with backing tape and the numbering of stamps. Engler stamps specializes in this.

For those who do not know the term center on center, it means that a coil stamp with a plate number will also have on the adhesive strip a back number. This back number may be at the top, bottom or even side of the stamp. The number acts a quality control measure to count the stamps in a roll and appears every 10 stamps. So if the plate number occurs every 27th stamp, a coil stamp with a plate number on the front and back number on the back of the adhesive strip would be 1 in 270. Consider too that the larger rolls are intended for businesses doing mass mailing and likely they do not bother seeking such stamps - they need to get their cards/flyers out! So some of the center on center stamps are lost. Also, unless you tell your heirs, they may remove the backing and use the stamps because a dealer told them such stamps are worth only postage. Therefore the "survival rate" of such stamps results in finding these less than 1 in 270 stamps (or if the plate number appears at a different number of stamps multiply 10 x the frequency which a coil stamp with a plate number appears).

I find it can be fun to order a roll or some from one to find one --- even if I don't get the minimum number to guarantee I get one.

They are referred to as number on number rather than center on center.

The back numbers are counting numbers and are not there for quality control, but for knowing how many stamps are left on a roll (or how many have been used).

What you call tape is known as the liner.

Depending on the issue, they can be found at the top or bottom or middle. I'm not sure what you mean by side. Sometimes the back numbering drifts out of place and can appear partly off the side of a stamp.

I was about to refer you to: https://goscf.com/t/89835 as that poster sells such things that interest you. Yes, then I notice both threads are yours. Oh well, tried.

Thanks guys and appreciate the correction. Engler stamps uses the incorrect nomenclature - center on center, the reason for my error. Yes and by side sometimes it seems the back number seems to drift to the side but again thanks for correcting me that it is simply top, middle or bottom. And got it regarding the term liner.