English silver hallmark dates provide the most reliable method for determining when silver pieces were made, using systematic date letter cycles that have been maintained for centuries.
Each English assay office maintains its own date letter cycle, typically running 20-25 years before restarting with different fonts or shield designs.
Important periods include the introduction of duty marks (1784-1890), changes in standard marks, and various font styles that help narrow down dating.
Combined with other hallmarks, date letters provide precise dating essential for authentication, valuation, and historical attribution.