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Collecting Cleaned Coins: A Controversial but Personal Choice
Identifying cleaned coins is a real challenge—especially when purchasing online. Photos don’t always reveal the subtle signs of cleaning, and it’s hard to tell whether the seller is unaware or simply not disclosing that a coin has been cleaned. Either way, it leaves the buyer guessing.

My Koyns
Jun 296 min read


Coins Across Oceans: The Spanish Colonial Currency of the Philippines
For over two centuries, Spain’s vast colonial empire—powered by global trade and the wealth of American silver mines—produced a wide array of coinage across its colonial mints. The majority of coins that circulated in the Philippines during the Spanish period were actually minted in Spanish colonial mints

My Koyns
May 184 min read


Etched in History: Philippine Counterstamped, Countermarked and Chopmarked Coins
Philippine counterstamped, countermarked, and chopmarked coins are coins that bear additional markings or alterations intentionally added to their surface. These modifications were typically applied for specific purposes—such as validation, reissuance, or authentication—depending on the historical and geographical context.

My Koyns
Apr 143 min read


The Manila Mint: A Turning Point in the Philippines' Monetary History
On March 19, 1861, the Manila Mint (Casa de Moneda) was inaugurated, marking the start of local gold coin production.

My Koyns
Feb 244 min read


Collecting Spanish-Philippine Coins: A Journey Through History and Heritage
Collecting Spanish-Philippine coins offers a unique glimpse into the rich history and heritage of the Philippines during its colonial period

My Koyns
Dec 6, 20243 min read


Decoding Dates on Japanese Yen Coins: A Beginner’s Guide with Meiji 1 Yen
When I added a beautiful 1893 Japanese 1 Yen silver coin to my collection, I had no idea how to read the date! Japan uses a fascinating dating system based on its emperors, and in this post, I’ll show you exactly how I deciphered it—from recognizing the Era to translating Japanese numerals.

My Koyns
Oct 28, 20243 min read


Mickey Mouse Money: The Story of Japanese Invasion Notes in the Philippines
During WWII, Japan issued its own currency in the Philippines—called Japanese Invasion Money. Nicknamed “Mickey Mouse Money,” these notes quickly lost value due to overprinting, lack of trust, and Allied counterfeiting. But behind these worthless bills lies a fascinating story of economic manipulation and wartime survival.

My Koyns
Oct 23, 20244 min read


Mule Coins of the Philippines: Rare Errors with a Twist of History
What do you get when a coin is struck using mismatched dies? In numismatics, it’s called a mule—and in the Philippines, there are three fascinating examples. From the rare 1918-S 5C to the recently recognized 1944-S 50C, this post dives into their stories, how to spot them, and why collectors find them irresistible.

My Koyns
Sep 19, 20243 min read
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