1817 or 1823 (Mark
during each of these
years is identical.)
1815
1816
1818
1819
1822
1821
1820
1824 to 1827
1828
The only time and place in the U.S. where hallmarks were required on silver was in Baltimore during the years 1814
to 1830.

The State Legislature of Maryland passed the Assay Act in early 1814, a law which created the Baltimore Assay
Office and required the assay of silver in Baltimore.  The Assay Act also set a quality standard for Baltimore silver,
requiring it to be 11 ounces of pure silver in every 12 ounce Troy pound, or 91.7% pure silver.  Any silver made in
Baltimore as of August 1, 1814, was required to be assayed and marked by the Assayer, certifying an item's silver
content met the new standard.

The Baltimore coat-of-arms was used as the quality mark.  The quality mark was in the shape of a clip cornered
rectangle during the years 1814 to 1823, then an oval shape was used 1824 to 1830.  Date letters were employed
indicating the year of assay.  A Head of Liberty mark was also occasionally used; this mark held no governmental
purpose but rather was used by some Assayers during their term.

In February, 1830, the Assay Act was changed, no longer requiring the hallmarks of the Assay Office.  In its place,
silversmiths were required to mark their own work with quality designations.  Several different numerical markings
were employed, designating the silver purity of an item.
1829
1830
Marks required beginning 1830, although some silversmiths used them earlier.
1814
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Year
Mark
Description
Rectangular shield
Letter B
No Head of Liberty mark
Rectangular shield
Letter E
Head of Liberty
Rectangular shield
Intertwined GF letters
Head of Liberty
Rectangular shield
Letter A
With or without Head of Liberty mark
Rectangular shield
Letter D
Head of Liberty
Rectangular shield
Letter C
Head of Liberty
Rectangular shield
Letter B
Head of Liberty
Rectangular shield
Letter G
Head of Liberty
Rectangular shield
Letter F
Head of Liberty
Large oval shield
Letter C
Small oval shield
Letter F
Small oval shield
Letter D
Small oval shield
Various symbols representing
quality marks
10 ounces silver per 15 ounces Troy
(89.6% silver)
11 ounces silver per 12 ounces Troy
(91.7% silver)
10.15, 10-15, 10 oz 15, 1015
11, 11 oz, 11-12, 11/12
11.2, 11-2, 925-1000
11 ounces 2 pennyweight silver per 12
ounces Troy
(92.5% silver / sterling)