Key date (English Wikipedia)

Barman, Scott (2 September 2019). Coin Collector's Handbook (91 ed.). United States: Lu lu. ISBN 978-0-359-89184-9. Archived from the original on 15 September 2023. Retrieved 12 September 2023.
Barman, Scott (2 September 2019). Coin Collector's Handbook (164 ed.). United States: Lu lu. ISBN 978-0-359-89184-9. Archived from the original on 15 September 2023. Retrieved 12 September 2023.

cnbc.com (Global: 303^rd place; English: 191^st place)

Nason, Deborah (January 10, 2015). "How—and whether—to invest in rare stamps and coins". CNBC. Retrieved 2023-09-18.

coinnews.net (Global: low place; English: low place)

"1909 Lincoln V.D.B. Cent". Coin News. CoinNews Media Group LLC. Archived from the original on 18 February 2020. Retrieved 15 June 2022.

coinweek.com (Global: low place; English: low place)

Reynolds, Greg (22 April 2015). "Classic U.S. Coins – Key Date Coins for Less Than $2,500 – Part 1: Copper". Coin Week. Archived from the original on 29 May 2023. Retrieved 12 September 2023.
Garrett, Jeff (6 June 2023). "Jeff Garrett: The Case for "Key Date" Coins". Coin Week. Archived from the original on 7 June 2023. Retrieved 12 September 2023.
"Key Date 1893-S Morgan Silver Dollar Offered at GreatCollections". Coin Week. 31 May 2019. Archived from the original on 6 June 2023. Retrieved 11 September 2023.
Reynolds, Greg (15 October 2015). "CAC buys Eliasberg 1893-S Morgan Silver Dollar for $646,250 at auction in Las Vegas". Coin Week. Archived from the original on 29 May 2023. Retrieved 11 September 2023.

merriam-webster.com (Global: 425^th place; English: 373^rd place)

"key date (noun)". Merriam-Webster Dictionary. Retrieved 2023-09-18.

money.org (Global: low place; English: low place)

Treasures in Your Pocket (PDF). Colorado Springs, Colorado: American Numismatic Association. 2023. p. 5. Archived (PDF) from the original on 25 December 2022. Retrieved 12 September 2023.

ngccoin.com (Global: low place; English: 6,191^st place)

"Top 50 Most Commonly Counterfeited U.S. Coins". NGC Coin. Numismatic Guaranty Company. Archived from the original on 24 January 2023. Retrieved 11 September 2023.

thefuntimesguide.com (Global: low place; English: low place)

coins.thefuntimesguide.com

"What Is A Key Date Coin? How Are Key Dates Different From Semi-Key Date Coins? And What Are Better-Date Coins?". Fun Times Guide. 2023. Archived from the original on 15 September 2023. Retrieved 12 September 2023.

thespruce.com (Global: low place; English: low place)

Susan Headley (21 June 2017). "What Is a Key Date?". Archived from the original on 1 December 2017. Retrieved 17 November 2017.

usmint.gov (Global: 5,667^th place; English: 3,885^th place)

"Coin Term Glossary". United States Mint. 3 June 2016. Retrieved 2023-09-18.

web.archive.org (Global: 1^st place; English: 1^st place)

Barman, Scott (2 September 2019). Coin Collector's Handbook (91 ed.). United States: Lu lu. ISBN 978-0-359-89184-9. Archived from the original on 15 September 2023. Retrieved 12 September 2023.
Treasures in Your Pocket (PDF). Colorado Springs, Colorado: American Numismatic Association. 2023. p. 5. Archived (PDF) from the original on 25 December 2022. Retrieved 12 September 2023.
"What Is A Key Date Coin? How Are Key Dates Different From Semi-Key Date Coins? And What Are Better-Date Coins?". Fun Times Guide. 2023. Archived from the original on 15 September 2023. Retrieved 12 September 2023.
Reynolds, Greg (22 April 2015). "Classic U.S. Coins – Key Date Coins for Less Than $2,500 – Part 1: Copper". Coin Week. Archived from the original on 29 May 2023. Retrieved 12 September 2023.
Garrett, Jeff (6 June 2023). "Jeff Garrett: The Case for "Key Date" Coins". Coin Week. Archived from the original on 7 June 2023. Retrieved 12 September 2023.
"1909 Lincoln V.D.B. Cent". Coin News. CoinNews Media Group LLC. Archived from the original on 18 February 2020. Retrieved 15 June 2022.
"Key Date 1893-S Morgan Silver Dollar Offered at GreatCollections". Coin Week. 31 May 2019. Archived from the original on 6 June 2023. Retrieved 11 September 2023.
Reynolds, Greg (15 October 2015). "CAC buys Eliasberg 1893-S Morgan Silver Dollar for $646,250 at auction in Las Vegas". Coin Week. Archived from the original on 29 May 2023. Retrieved 11 September 2023.
Susan Headley (21 June 2017). "What Is a Key Date?". Archived from the original on 1 December 2017. Retrieved 17 November 2017.
Barman, Scott (2 September 2019). Coin Collector's Handbook (164 ed.). United States: Lu lu. ISBN 978-0-359-89184-9. Archived from the original on 15 September 2023. Retrieved 12 September 2023.
"Top 50 Most Commonly Counterfeited U.S. Coins". NGC Coin. Numismatic Guaranty Company. Archived from the original on 24 January 2023. Retrieved 11 September 2023.

Key date (English Wikipedia)

books.google.com (Global: 3rd place; English: 3rd place)

cnbc.com (Global: 303rd place; English: 191st place)

coinnews.net (Global: low place; English: low place)

coinweek.com (Global: low place; English: low place)

merriam-webster.com (Global: 425th place; English: 373rd place)

money.org (Global: low place; English: low place)

ngccoin.com (Global: low place; English: 6,191st place)

thefuntimesguide.com (Global: low place; English: low place)

coins.thefuntimesguide.com

thespruce.com (Global: low place; English: low place)

usmint.gov (Global: 5,667th place; English: 3,885th place)

web.archive.org (Global: 1st place; English: 1st place)

books.google.com (Global: 3^rd place; English: 3^rd place)

cnbc.com (Global: 303^rd place; English: 191^st place)

merriam-webster.com (Global: 425^th place; English: 373^rd place)

ngccoin.com (Global: low place; English: 6,191^st place)

usmint.gov (Global: 5,667^th place; English: 3,885^th place)

web.archive.org (Global: 1^st place; English: 1^st place)