Authentication Guide: 1751-1772 Lima Pillar Coinage – Critical Diagnostic Points

Authentication Guide: 1751-1772 Lima Pillar Coinage – Critical Diagnostic Points

With counterfeit specimens flooding the market, knowing the specific diagnostic points for this series is absolutely critical for any serious collector.

Historical Significance

The 1751-1772 Lima pillar coinage represents one of the most challenging and fascinating series in Latin American numismatics. These coins were minted during a transitional period in Spanish colonial monetary policy, making them particularly vulnerable to counterfeiting operations that emerged in the late 20th century. The series captures a pivotal moment when colonial mints were transitioning from earlier shield-type designs to the iconic pillar-and-wave motif that would dominate Spanish colonial coinage for decades.

Key Authentication Markers

Weight specifications for genuine specimens typically fall within 3.0-3.2 grams for the 1 real denomination. Deviations beyond 0.2 grams should immediately raise suspicion. The coins should exhibit a slightly warm, golden tone characteristic of authentic Spanish colonial silver, not the harsh white appearance of modern reproductions. The luster should be soft and natural, with no signs of artificial toning or chemical treatment.

Magnetic Properties

Genuine specimens are non-magnetic. Any magnetic attraction indicates either a counterfeit or a heavily debased piece. This simple test eliminates approximately 90% of modern fakes and should be your first line of defense when evaluating potential acquisitions.

Die Markers and Varieties

Each date and mint combination has specific die characteristics that experienced collectors learn to recognize. The 1757 Lima real, for instance, shows distinctive wide letter spacing that became a target for counterfeiters. The 1752 variety with the dot above the ‘L’ in ‘LIMA’ is particularly rare and often faked. Brad Yonaka’s upcoming second edition of his variety guide will be essential for collectors, as it documents previously unknown varieties and provides detailed die studies that will help authenticate these challenging pieces.

Common Fakes and Their Characteristics

The most frequently counterfeited dates include the 1751 (unique and nearly impossible to acquire), 1752, 1766, 1767, 1768, and 1772. These dates are targeted because of their rarity and high collector demand. Common fake characteristics include incorrect weight (usually too light), improper toning or artificial aging, weak or missing details in the pillars and waves, incorrect die alignment, and modern edge reeding patterns that don’t match period specifications.

Testing Methods

Beyond basic weight and magnetic testing, collectors should employ the following methods to authenticate their specimens with confidence.

Visual Inspection

Examine under 10x magnification for tooling marks, casting bubbles, or modern die deterioration patterns. Authentic coins show natural wear patterns consistent with circulation, not uniform surface treatment. Look for the characteristic flow lines that appear when genuine silver is struck under proper pressure. The strike quality should be sharp where the dies were fresh, with natural softness in areas that saw high circulation.

Specific Gravity Test

Silver has a specific gravity of 10.49. Deviations beyond 0.2 suggest either counterfeit or heavily debased material. This test is particularly useful for the rare dates where visual inspection alone may be insufficient. The specific gravity test provides scientific confirmation that can be crucial when dealing with high-value specimens.

Die Match Verification

Compare suspected specimens against known authentic examples. The 1760 Carolus variety, for instance, has unique characteristics that are extremely difficult to replicate accurately. Collectors should maintain reference libraries of authenticated specimens and consider joining specialized groups where members share authentication expertise and high-quality reference images.

Rare Date Analysis

The 1751 date is unique with fewer than 100 minted, making it virtually impossible to acquire in any condition. The 1752, while having a reported mintage of over 400, is exceptionally rare with perhaps 10-25 surviving specimens. The 1760 Carolus, 1766, 1767, 1768, and 1772 all show survival rates far below their mintages, suggesting massive melting or loss. These survival statistics make authentication even more critical, as the numismatic value of authentic specimens continues to appreciate.

Market Considerations

Recent auction results show the 1766 selling for $660, while the 1752 2 reales has seen competitive bidding that reflects its extreme rarity. The 1757 remains the most commonly available date, though still considered scarce. Collectors should be particularly cautious with online purchases, as the anonymity of internet transactions has facilitated counterfeit distribution. Always request detailed photographs and provenance information before committing to high-value purchases.

Conclusion

The 1751-1772 Lima pillar series represents both a numismatic treasure and a minefield for collectors. Success requires patience, education, and often the guidance of experienced specialists. The upcoming second edition of Yonaka’s variety guide will be an invaluable resource, but collectors must still develop their authentication skills through hands-on experience and study. Remember that if a deal seems too good to be true, it almost certainly is. Focus on building relationships with reputable dealers and other collectors who can provide guidance and verification. The true reward lies not just in acquiring these coins, but in the knowledge gained through careful study and authentication of each piece in your collection. Your expertise in authentication becomes as valuable as the coins themselves, creating a legacy that extends beyond mere monetary worth.

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