Rare 7p Machin Stamp (P70)

Hello,

sorry for asking this again, but I think my question was a bit lost in my other thread. In the connoisseur catalogue for Machin stamps, in chapter 2 on page 33, there is a 7p stamp:
http://www.connoisseurcatalogue.net...chapter2.pdf

which is the thing that makes this stamp valuable?

it says:
Deep reddish brown + CB
head: B1
value type: Thin
cyl 8 N.Dot Exptl PCP

is it the cylinder, or the experimental PCP?

The pdf is very invasive and I don't want to download it into my computer to look at it. Why don't you just post a picture please?

No picture for the listing

yes, there is no image, and I copied exactly the text into my post. So now the information is more than complete about this catalogue entry :).

But it seems nobody here has an idea about this stamp?

so maybe I can ask two more general questions which could help in understanding this listing:

- is the cylinder information for Machin stamp to read in that way that you always need a selvage with its number to prove the stamp to be from that listing? or is it just an additional information?

- what is the experimental PCP, how can we see if a stamp is made on it?

Cylinder number just confirms where the type comes from. It's not a requirement.

I don't know what experimental PCP is, but I am wondering why this catalog does not explain their terminology?

PCP = Phosphor Coated Paper

Machin Terms
https://adminware.ca/machin/m_terms.htm

thank you both. good to know that in this case the cylinder is not the deciding factor, as for other Machin stamps it is sometimes.

Yes, I found what PCP is, and Rod shows it above, but not the experimental paper. Maybe this makes the 7p rare? Or maybe the combination of head, value, tagging?

hy-brasil, I've had a good look through this catalogue and find that some of the terminology is explained at the beginning of each chapter. So if you find a term in, say, Chapter 3, you may have to look back to Chapters 1 or 2 to find the term explained.

would be interesting to know if the experim. PCP is mentioned in the Deegam catalogue, and further, if the "rare" 7p Machin stamp is mentioned in the Deegam? I don't own this catalogue.

Here is the excerpt from Deegam:

I believe the stamp in question is DG 70.2.1b (AOP + CB means all over phosphor plus center band). It is given a value code of 7 which means:

Hope this helps.

Robert

thank you very much. interesting to see how the Deegam has listed it or Machin stamps in general, maybe every collector of Machins needs one. Still, I am not totally sure if this is the stamp from the Connoisseur catalogue, but it's probable, if Deegam does not show other similar 7p stamps. Connoisseur does not mention the all over phosphor but the exp. PCP, which for other stamps is not rare though. That's wh at the beginning I thought it's because of the combination of head, value type and (perhaps) cylinder.