Which Scott Nr. Is This Stamp: # 170 Or #195 ??

thank you essayk,

i've found the stamp, is sc.# 148, Carmin, national printing, no secret mark, secound 6c stamp are #159 dull pink with secret mark... but I have another one 6c Stamp with " WAR DEPT." instead of " US Postage ".. like #148 and this I can not find. no matter, I have time to look??

THANK YOU, YOUR LINK HAVE REALY HELP ME. yes, I must bay one US Catalog inkl. envelopes and wrappers .

Thanks studebaker, I've found, it's sc. #O117 :-)

That's an Official stamp and will be found in the Officials section of a Scott Catalogue (Back of the Book). War Dept., State Dept., Treasury, Post Office etc. all had their own stamps back then. The Scott system gives them O numbers; they come after Postage Due (J numbers) and K (Offices in China) but before P (Newspaper).

edited to correct the stupid autocorrect

Very informative thread & great links.

Thank you all

Regards,
Stampalotapus

Ancezi,
For stamped envelopes, wrappers, and letter sheets, this site is the best that I have ever found: http://www.vfthomas.com/USstampedenvelopeshome.htm

To fully utilize that site, you do need to have a Scott Specialized Catalogue of United States Stamps to know what is more collectible than others.