Sources
- “1943 25C (Regular Strike)”. PCGS. Accessed February 8, 2024.
- “1943-D 25C (Regular Strike)”. PCGS. Accessed February 8, 2024.
- “1943-S 25C (Regular Strike)”. PCGS. Accessed February 8, 2024.
- “1943 25C MS”. NGC. Accessed February 8, 2024.
- “1943-D 25C MS”. NGC. Accessed February 8, 2024.
- “1943-S 25C MS”. NGC. Accessed February 8, 2024.
- “Washington Quarter”. PCGS. Accessed February 8, 2024.
- “Type 1, Silver”. PCGS. Accessed February 8, 2024.
- “Washington Quarters (1932-1998)”. NGC. Accessed February 8, 2024.
- “VarietyPlus: Washington Quarters (1932-1998)”. NGC. Accessed February 8, 2024.
- “Washington quarter”. Wikipedia. September 23, 2023. Accessed February 8, 2024.
- “John Flanagan”. Wikipedia. December 22, 2023. Accessed February 8, 2024.
- Heritage Auction search results for “1943 25c Washington error”. Heritage Auctions. Accessed March 15, 2024.
- “NGC Census: Washington Quarters (1932-1998)”. NGC. Accessed February 8, 2024.
- “1943-S Washington Quarter – Struck on a Five Cent Planchet”. Heritage Auctions. Accessed March 14, 2024.
- “1943 25C Washington Quarter – Struck 65% Off Center”. Heritage Auctions. Accessed March 14, 2024.
- “1943-S Double Die Obverse”. Legend Rare Coin Auctions. Accessed March 14, 2024.
- “1942 25C Double Die Obverse (Regular Strike)”. PCGS. Accessed March 14, 2024.