Tuesday, July 7, 2026

Types Of Counterfeit: Altered Dates

When one date in a series is worth much more than another, a counterfeiter may try to use a tool to try to change the date of a common issue into a rarer date. Altered dates can be deceptive since the original coin was genuine with the correct details, weight and composition—only the date is illegitimate.

Even the most skilled coin doctor will always leave behind “tool marks,” which are lines left by the tool used to sculpt the new date. Not surprisingly, these tool marks are usually concentrated around the digit that has been altered. Like counterfeits, coins with altered dates or mintmarks will not be certified by NGC. Coins with other types of tooling are eligible for NGC Details grading, which assigns an adjectival grade along with a description of the problem. Source

Saturday, July 4, 2026

Happy Independence Day!

 


Happy Independence Day from us at Martinez-Vallejo Coin Exchange!

3755 Alhambra Ave Ste 1

Martinez CA 94553

925-335-9500


Wednesday, July 1, 2026

How to Collect Gold Scrap

Collecting gold scrap can be a fun way to make some extra money. For this modern-day treasure hunt, your best bet is to look for gold jewelry in flea markets and thrift shops. If you’re down for a chemistry experiment, you can also mine for gold in your old computers and other electronics. Once you’ve got a collection going, send it along to a buyer online or locally to cash in on your shiny finds!

1.) Look for flea markets or shops with costume jewelry. This is the easiest way to collect scrap gold. Google flea markets and thrift shops near you. It’s best to look for larger flea markets with lots of vendors, as these events will concentrate the most potential gold in one spot. Some flea markets might operate more like festivals and will only be open for business once per year.

2.) Visit the market in the morning. The earlier you get to the market or shop, the better. Aim to arrive 15 minutes before it opens so you can be one of the first visitors to take advantage of cool finds and great deals. Go for the costume jewelry displays first, then move on to the more expensive collections.

It’s best to schedule your gold hunt on a day when you don’t have anything else going on. Pick a day off from work or a free Saturday so you can spend hours looking for your treasures.

3.) Find a pocket-sized magnet to bring along. You can purchase a magnet online or at a local hardware store. Look for one that’s about the size of a domino. You can use this tool to test if jewelry is gold or just another metal that’s been plated with gold.

The magnet won’t stick to real gold. Test clasps and other parts of jewelry separately. Sometimes a clasp will be plated, but the majority of the piece will be real gold.

4.) Search for markings showing the gold content of the piece. Look for labels showing what type of gold the jewelry is. In the United States, most jewelry will be stamped as 10K, 14K, 18K, or 24K. The “K” stands for a karat (sometimes spelled carat), a measurement that indicates the amount of gold in an item. A 24K piece is pure gold.

For jewelry made outside of the United States, you may just see numbers instead of karat markings. 10K translates to 417, 14K is 585, 18K is 750, and 24K is 999.

5.) Avoid jewelry with manufacturing markings. Some jewelry will be labeled with an assortment of letters. These markings show that the gold is plated. Stay away from the following:

  • GE, which means gold electroplate. You may also see GP, which stands for gold plated.
  • HGE, or heavy gold electroplate.
  • GF for gold filled.
  • HGP, or heavy gold plate.

It’s also a good rule of thumb not to purchase jewelry with unusual or unidentifiable markings. These are usually a good indicator that it’s not gold.

6.) Don’t spend over $10 USD per piece. The only way to make money off your gold scrap is not to spend too much collecting it! Many flea markets will allow you to buy a whole bag of mixed costume jewelry for between $2 and $10 USD. You can also choose to purchase individual pieces. And don’t forget to haggle!

Offer your vendor less than their asking price and hesitate when they give you a higher counter-offer. You could say something like: “I can give you $2 instead of $5 for that bracelet.”

Sunday, June 28, 2026

The Hobby Of Kings And The Rise Of Numismatics

The main difference between coin collecting before and after the Renaissance is the development of an active market. With the new wave of interest, demand for antique coins greatly exceeded the available supply. During the 15th and 16th centuries, ancient-coin collecting became the “hobby of kings,” and the list of collectors is a list of European nobility. At the same time, famous artists were employed by these patrons to create replicas of ancient coins and portrait or commemorative medals, which became collectible in their own right. The appetite of collectors fueled a cottage industry of agents and prompted a search of source lands for salable artifacts. As might be expected, the insatiable market created such demand that it also fostered the introduction of forgeries.

By the 17th century, the nature of collecting had shifted slowly toward serious research. As a result, very broad collections were formed, studied, and cataloged. Numismatics became an academic pursuit, and many important treatises were published during that period. The involvement of institutions and the rise of public collections in the 18th century led to sponsorship of academic study, which elevated numismatics to the stature of a science. Most important, the exchange of information and new discoveries was formalized through detailed and widely published treatises on the topic of coins and collecting. Many of the large private collections of noble families came under state control during this period, and the subsequent cataloging of these holdings added volumes to existing knowledge. This information was readily available to the general public, and coin collecting became a pursuit of middle-class merchants and members of the various professions who were growing in numbers as well as cultural sophistication. Collecting ancient coins is one of the few ways that the average person can own actual objects from antiquity, and this point was not lost on the growing collector base. Coins are remarkably accessible pieces of history. Source

Thursday, June 25, 2026

War Nickels; What They Are And Why To Search For Them

 


 Learn all about Henning War Nickels here and why you would keep your eyes peeled for them to add to your coin collection! 

Monday, June 22, 2026

Types Of Counterfeit: Transfer Die Counterfeits

These fakes have become increasingly commonplace in the last few decades. Unfortunately, this type of fake can also be the most deceptive. A genuine coin is used to create a die that is an exact mirror image of the coin. This includes any and all marks, scratches or other issues on the surface of the genuine coin. As a result, every fake struck from these counterfeit dies will have the same depressions (marks are called “depressions” on counterfeits). NGC graders look for these repeating depressions as well as overall weak details to identify fakes made from transfer dies. These spurious pieces may also have incorrect weights and compositions as well as unusual luster.

Source

Friday, June 19, 2026

Happy Fathers Day

Happy Fathers Day from us at Martinez Coin & Jewelry Exchange to you!

Have a blessed weekend celebrating how amazing you truly are.

3755 Alhambra Ave Ste 1

Martinez, CA 94553

CALL US: 925-335-9500