1950-D/S Washington Quarter Overmintmark

The 1950-D/S is one of the best-known overmintmark varieties in the Washington quarter series, showing evidence of an S mintmark punched into the die before being corrected with a D. This type of error, sometimes called a repunched mintmark or overmintmark, is a favorite among collectors specializing in Mint errors and varieties.

It is part of a small family of similar 1950s overmintmark errors found on Washington quarters and other denominations from this period, reflecting how mintmark punches were manually applied to dies at the time.

Before mintmarks were added to master dies at the hub stage, individual working dies had their mintmarks hand-punched at the mint of use, a process that occasionally led to mistakes when a punch for the wrong mint was used and then corrected. In 1950, a Denver Mint quarter die appears to have been punched first with an S (associated with San Francisco) before being corrected with the proper D, leaving remnants of the S visible beneath or beside the final D.

Similar overmintmark errors from this period are also known on Washington quarters and other denominations of the era, and they have become a well-studied category within the broader field of Mint error and variety collecting.

The coin otherwise matches the standard Washington quarter design, with Washington's left-facing portrait on the obverse and a heraldic eagle above crossed arrows and olive branches on the reverse. The key diagnostic is the mintmark itself, located on the reverse below the wreath, where careful examination under magnification reveals the outline or remnants of an S underlying or beside the final D.

Because the underlying letter can be subtle or worn down on circulated coins, collectors typically use magnification and compare the mintmark area to published diagnostic images, and many pursue third-party certification specifically attributing the overmintmark to confirm it is a genuine die feature rather than damage or a die chip.

The 1950-D/S commands a meaningful premium over a common 1950-D quarter, with pricing tied to how clearly the underlying S is visible and the coin's overall grade. Sharp, well-defined examples generally bring stronger prices than coins where the underlying mintmark is faint or ambiguous.

As with other repunched mintmark varieties, value depends heavily on collector demand for Mint errors and varieties specifically, and certified, clearly attributed examples tend to command more consistent prices than raw, uncertified coins.