UX1 1c Liberty, brown on buff card issued May 13, 1873 in Boston,
New York City and Washington, DC. This card has a large (90x60mm) USPOD watermark in
the monogram. The watermarks for UX1, UX3 and UX4 are found in the normal position,
inverted, reversed, and inverted and reversed. The watermark is often dim.
UX3 1c Liberty, brown on buff card issued July 6, 1873. This card has a small (53x36mm) USPOD watermark in the monogram. The watermark is often dim.
UX3a 1c Liberty, brown on buff card issued July 6, 1873. This card does not have the USPOD watermark in the monogram. No unused cards of this type are known. Cards offered as "no watermark" are either unwatermarked proofs, or have partial or vague watermarks.
UX4 1c Liberty, black on buff card issued September 28, 1875.
This card has a small (53x36mm) USPOD watermark in the monogram. The watermark is
usually
dim on this card. The card is inscribed: "WRITE THE ADDRESS..."
UX5 1c Liberty, black on buff card issued September 30, 1875. This card does not have the USPOD watermark in the monogram. The card is inscribed: "WRITE THE ADDRESS..."
UX7 1c Liberty, black on buff card issued October 17 (?), 1881. This card does not have the USPOD watermark in the monogram. The card is inscribed: "NOTHING BUT THE ADDRESS."
UX7a 1c Liberty, black on buff card issued October 17 (?), 1881. This variety has 23 teeth below the words "ONE CENT".
UX7b 1c Liberty, black on buff card issued October 17 (?), 1881. This variety is printed on both sides.
UX6 2c Liberty, blue on buff card, issued December 1, 1879.
UX6a 2c Liberty, dark blue on buff card, issued December 1, 1879. Frame around card.
UX13 2c Liberty, blue on cream card, issued January 25, 1897. Frame around card.
UX16 2c Liberty, black on buff card, issued 1898. No frame around the card.
UX8 1c Jefferson, brown on buff card, issued August 24, 1885.
Varieties include color variations and impressions.
UX8a Orange brown
UX8b Red brown
UX8c Chocolate brown
UX8d Double impression
UX8e Double impression with one impression inverted
UX8f Printed
on both sides.
UX9 1c Jefferson, black on buff, issued December 1, 1886. On
this card, Jefferson's head faces right and is centered on the card. Varieties include card stock
and
impressions.
UX9a Black on dark buff card
UX9b Double impression
UX9c Double impression with one impression inverted.
UX10 1c Grant, black on buff card, issued in December 1891.
This card is 155x95 mm. Varieties include different impressions:
UX10a Double
impression with one impression inverted
UX10b Double impression.
UX11 A smaller version of this card (117x75mm) was issued as UX11 in blue on grayish white stock. UX11 cards printed in black instead of blue are proofs.
UX11b Double impression with one impression inverted
UX12 1c Jefferson, black on buff card, issued January 2, 1894.
Card is 140x89mm. Varieties include:
UX12a Double impression.
UX14 1c Jefferson, black on buff card, issued December 1,
1897. Head of Jefferson is same as UX12, but wreath is more ornate than UX12. Card is
slightly smaller (139x82mm) than UX12. 
Varieties include:
UX14a Double impression with one impression inverted
UX14b Printed on
both sides
UX14c Double impression
UX15 1c John Adams, black on buff card, issued March 31,
1898. Card is 126x74mm.
UX16 1c Liberty, black on buff card, issued 1898. Card is
140x82mm.
