Sub-group PC-C: Franks generated by software from Stamps.com (StampMaster before 1999), ID numbers with 06#S prefix[edit | edit source]
The first stamp design has a negative S in oval logo. All others contain stamps.com somewhere in the design.
Found with and without FIM barcode at upper left.
Mail classes found with PC-C stamps:
A. FIRST CLASS [RR]
B. FIRST CLASS MAIL
C. PRIORITY MAIL
D. EXPRESS MAIL
The StampMaster/stamps.com system was first trialed in the Washington DC area and in parts of California sometime before August 1998. It was made available nationally on September 27, 1999.
Type RB1 in 2001 edition
PC-C1. StampMaster, summer 1998. [$200]
Experimental stamp with negative “S”/Internet Postage logo at top center.
At top right are value figures, mail class, "US POSTAGE”, and date.
"PDF417" bar code across bottom with town line below at left and identification number below at right.
Identification number with 061S prefix.
V/F: $0.00o
Type RB2 in 2001 edition
PC-C2.1. stamps.com, 1999.
As Type PC-C1 but with "stamps.com" logo instead of the S in oval logo.
Identification number with 061S or 062S prefix below right of barcode.
V/F: $0.00o
a. With "ADDITIONAL POSTAGE" instead of class of mail below "US Postage"
b. With "CORRECTION" instead of class of mail below "US Postage"
c. With bottom line missing, blank below bar code
d. Bottom line present but without bar code
e. With "MAIL TO:" and ZIP code above left of the bar code
f. With nonsense characters across the bottom (system malfunction)
NOTES:
The "stamps.com" logo can vary considerably in size.
The system could produce a re-date stamp without postage value, as shown (right).
Type RB3 in 2001 edition
PC-C2.2. 2000.
As Type PC-C2.1 but with larger inscriptions.
Identification number with 062S prefix below right of 2D "PDF417" barcode.
Town line with town, state and ZIP code or with MAILED FROM and ZIP code.
V/F: $0.00o
a. With "ADDITIONAL POSTAGE" instead of class of mail below "US Postage"
b. With "CORRECTION" instead of class of mail below "US Postage"
c. With bottom line missing (blank below bar code)
d. With "MAIL TO:" and ZIP code above left of the bar code
e. With mailer's name replacing town line
NOTES:
The NOTES below PC-C2.1 apply to PC-C2.2 also.
These stamps can be printed directly to the mail piece or on labels. Stamps.com provided L-shaped labels with pink fluorescent bars along the top and right.
PC-C2.3. 2005.
Downloaded directly from the Stamps.com web site.
Stamps.com” logo at far right of 2D "PDF417" barcode.
At top left: postage value above "US POSTAGE" and class of mail.
At top right: identification number with 062S prefix above "FROM" and ZIP code.
A. Basic stamp without framing
B. Stamp at top right of address label with large mail class indicator to its left and the class of mail spelled out below.
V/F: $0.00 $00.00
a. With "COMMERCIAL BASE PRICING" below the rate statement.
PC-C2.4. 2005.
As Type PC-C2.3 but with rate statement instead of value figures.
Stamps.com logo right of "PDF417" barcode.
"US POSTAGE & FEES PAID" at top left above rate statement.
ID number with 062S prefix above mailer’s Zip code at top right.
A. Basic stamp without framing
B. Stamp at top right of address label with large mail class indicator or solid block to its left and the class of mail spelled out below.
a. With "COMMERCIAL BASE PRICING" or "COMMERCIAL PLUS PRICING" below the rate statement
b. With panel containing advertisement above the frank
PC-C2.5. 2014.
Similar to Type PC-C2.4 but the stamps.com logo is above the right end of the "PDF417" barcode.
One seen so far, in a large frame with tracking barcode at left.
Identification number with 062S prefix.
With "US POSTAGE & FEES PAID" instead of value figures.
PC-C2.6. 2015.
Very similar to Type PC-C2.3B but "U.S. POSTAGE" is right of the value figures rather than below them.
Identification number with 062S prefix.
V/F: $0.00 $00.00
PC-C3.1. 2007.
Stamp with horizontal "IBI Lite" barcode.
Small frank with value figures at top above "U.S. POSTAGE", class of mail, "FROM" ZIP code, and date.
Below the date are the stamps.com logo, the barcode, and identification number at bottom.
Identification number with 062S prefix.
V/F: $0.00o
PC-C3.2.
As Type PC-C3.1 but the "IBI Lite" barcode is vertical at right next to the identification number reading down at far right.
Identification number with 062S prefix.
Town line "FROM" and ZIP code
V/F: $0.00o
a. Identification number omitted
b. Town line without ZIP code showing "FROM" alone
NOTE: These stamps can be printed directly to the mail piece or on labels. Stamps.com provided L-shaped labels with pink fluorescent bars along the top and right.
PC-C4.1. 2011.
Frank similar to Type PC-C3.1 but it has a square Datamatrix barcode.
It appears in a large frame at the top of an address label.
Text at top shows the value figures, weight, "FROM" ZIP code, mail class, identification number, and date.
Identification number with 062S prefix.
The country name is not in the frank itself but is found at top left of the frame.
V/F: $0.00
PC-C4.2. 2011.
As Type PC-C4.1 but the text is at left of the square Datamatrix barcode rather than above.
It appears unframed at the top of an address label.
Identification number with 062S prefix.
The country name is not in the frank itself but is below and to its left.
A. With value figures
B. Without value figures
V/F: $0.00
PC-C4.3. 2002.
Very wide design with large "Delivery Confirmation" 1D barcode at center and square Datamatrix barcode at right.
Above the 2D barcode are the weight, ZIP code, ID# with 062S prefix, and date.
At far left is the class of mail above “US POSTAGE PAID”.
A. Without value figures. The "stamps.com" logo is below the 2D barcode.
B. With "stamps.com" logo and value figures at top above the 2D barcode: $0.00
C. Without value figures but otherwise as B, with "stamps.com" logo at top
a. Without tracking barcode at center
Types SE1 and SE2 in 2001 edition
PC-C4.4. 2002.
Downloaded directly from the Stamps.com web site.
Square Datamatrix barcode at right with "stamps.com" reading up to its right.
Text left justified as follows:
Value figures at top above "US POSTAGE", mail class, date, ID number, and ZIP code
Identification number with 062S prefix.
A. Value figures above "US POSTAGE. V/F: $0.00
B. Without value figures. "US POSTAGE & FEES PAID" above date, ID# with 062S prefix, ZIP code, rate statement
PC-C5.1.
With "DPDF417" barcode as with Types PC-C2.1 through PC-C2.5 but without "stamps.com" logo.
Top panel contains USPS eagle logo and Click-N-Ship® logo.
Value figures and "US POSTAGE" at left.
Tracking number above the barcode.
Identification number with 062S prefix.
V/F: $0.00, $00.00
a. With "Commercial Base Pricing" immediately below the 2D barcode
PC-C5.2.
Similar to Type PC-C5.1 but very wide imprint with Click-N-Ship® logo above usps.com (without the eagle-head logo)/ "US POSTAGE / PAID" at left.
Along the bottom are the weight, date, Mailed from ZIP code, and identification number with "062S" prefix.
"Commercial Base Pricing" is immediately below the barcode.
Without value figures; rate statement only.
It appears that this stamp is generated only for International Priority and Express mail services.
Two versions are known:
A. Tracking barcode at far left in the panel. Smaller lower panel contains the mail class statement.
B. Smaller stamp, traditional barcode at center of panel, USPS logo at far left. A Customs Declaration statement appears above the traditional barcode. No lower panel containing a mail class statement, and no indication anywhere of the mail service being used.
FIRST CLASS 
[RR]
[$200]
V/F: 
