ID Help - SC 344 With Schermack

Can anyone please help me with more info on this? My old Scott classic specialized does not list the various schermack perforations.
The 'base' is a sc 344 (Wmk 191). Can anyone determine type of schermack perforation - and does this have a designated scott number?
(dimensions of the perfs are approx 4,7 - 3,2 - 4,7 mm)
Much appreciated!



Edit - Hmmm, forgot the pic.

This auction house shows a Type III.

http://www.usphila.com/us/stamp/pri...t-344-page-1

KGB - Thanks a lot, that's really helpful. I see that object on USPhila is listed with cat val $500 - (wow!) - I presume that must be because of the perfin / control mark on that object?

Here are the specifications for the Type III.

http://www.slingshotvenus.com/stamp..._III_doc.pdf

You're welcome. It's always a pleasure helping you because you're so polite!

KGB - Thank you for the kind words - and thanks for the Schermack info . The measurements I did seems to match very well with that description.

Does anybody knows if this has a dedicated scott number and its nominal cat val?

Blaamand, you say that your old Scott does not list Schermack ( and other private ) perforations. That's weird! How old is your catalog? I am looking at a 1987 Scott Specialized, and it shows all these oddball perforations on page 478, under "vending and affixing machine perforations". They should be listed just after the booklet panes and just before the chapter on imperforate coil stamps.

Peter

Hi Peter, Thanks for trying to help. Apologize, I should have stated I am looking in the Scott WW Classic specialized 1840-1940. I'm at work offshore, and my 'main' catalogs are kept at home, including my Scott US specialized.

May I ask if you found the sc number - or are there no designated numbers for the schermacks?

Nominal catalog value is 1.25 USD in my 2006 specialized. If it higher now, it is catalog-inflation, not really worth more.
Existence of perin control marks make all the difference, some varieties are quite rare.

US Scott No. 344 with Schermack Type III perforations is the correct listing. My 2013 Scott Specialized continues to list used singles at $1.25 catalog value.

(This happens to be one of those situations where a stamp with conventional perforations is worth more than the same stamp with the Schermack perforations.)

chasa and wt1 - thanks to both of you! I had expected the perfin control mark (or lack thereof) to make the difference in value. No worries,then I'll simply put this Schermack with the imperf issues, with a 'type III' write-up. I am a bit surprised Scott has not listed the different types as dedicated numbers or varieties, but presume it's got to do with that the schermack perf were not applied by the usps.
Anyway, moving on, again appreciating all you helpful people.

All of the vending and affixing machine private perforated stamps are listed toward the back of the book in the Scott Specialized. There is an on-going discussion about listing them in the front of the book along with their USPO counterparts but as yet that probably won't happen anytime soon, if at all. I believe the majority of the imperforate (#344)sheet stamps were purchased from the USPO and used by the private vending/affixing companies, which explains why the catalogue value for a #344 is more than a #344 with Schermack Type-III perfs. Lots of Schermack Type-IIIs survived. Your copy, with the scuff on it, has little if any value. Its actually more difficult to find a #344 used on cover (especially non-philatelic) than it is to find #344 with Schermack Type-IIIs on cover. Perfin control markings do increase value for the more scarce control perfins. There is a good series of articles in The United States Specialist, issued by the United States Stamp Society on perfin control numbers and their use.

Al - Thank you for adding even more information about this subject . I'm learning more every day on this forum

FYI - H DNA C has sent me lots of material concerning various vending machines issues, so I got all the info I need know! Excellent stuff, Thanks!