Coin Identification and Valuation [resuelto]

Subject: 1993 Russia 50 Rubles (MMD) - Brass-plated Steel with Major Edge Plating Error

Description:

• Denomination: 50 Rubles.

• Year: 1993.

• Mint Mark: MMD (Moscow Mint).

• Material: Brass-plated Steel (Magnetic).

• Weight/Type: Y# 329.2.

• Error Type: Significant Planchet Error (Edge Plating Error). The steel core is prominently visible along the entire edge. This occurred during the blanking process where the steel core remained exposed after being punched from the plated sheet.

• Condition: Excellent luster on both obverse and reverse, with some minor oxidation points on the exposed steel edge, confirming the authenticity of the error.

With most clad coins, the core being visible is completely normal, this isn't an error at all. 

N#16501

Not really worth much there are plenty available for very cheap.

Would seem obvious from you own statement, “This occurred during the blanking process where the steel core remained exposed after being punched from the plated sheet.”  How would the steel core be covered if it was already plated. There might be some drag down of the plating but not enough to cover the inner core.

Thank you for your feedback. I appreciate the clarification regarding the standard production methods for the 1992-1993 Russian issues.

However, my goal is to document this specific 'sandwich effect' as a significant technological variety of the transition period. While it is true that many coins from this era show a visible core, the specimens in my collection exhibit a particularly prominent edge plating exposure (blanking error).

In numismatics, specifically in 'error and variety' collecting, this is categorized as a planchet-level defect because the protective plating was applied to the sheet prior to punching out the blanks, leaving the vertical edges completely unprotected and prone to oxidation.

What makes my study unique is that I have documented this consistent 'error' across:

1. Multiple Denominations: Both 5 and 50 Rubles.

2. Both Mints: Leningrad (LMD) and Moscow (MMD).

3. Chronological Transition: Comparing these magnetic steel 'sandwich' coins with my 10 specimens of the non-magnetic 1993 LMD 50 Rubles (Aluminum-Bronze), which feature a solid composition and an interrupted reeded edge.

While individual circulated coins might have low market value, a systematic set that proves the failure of edge-plating quality control across different years and mints holds significant educational and numismatic value for those studying post-Soviet minting history.

I am looking for specialists who categorize these as 'uncovered edge varieties' rather than just common circulation wear.

To further support my research into the 1993 transition, I have also compared these 'sandwich' errors with a group of 10 specimens of the 50 Rubles 1993 LMD (non-magnetic).

These coins serve as the 'control group' for the transition:

• Composition: Solid Aluminum-Bronze (Yellow brass appearance).

• Edge: Interrupted reeded edge (not smooth), with no visible core.

• Context: These were produced early in 1993 before the mint switched to the cheaper plated steel planchets used for the magnetic MMD and LMD varieties.

The fact that the LMD mint produced both the high-quality solid bronze reeded-edge coins and the lower-quality plated steel smooth-edge coins in the same year is exactly why this set is numismatically significant. It captures the exact moment the Russian monetary system compromised production standards due to hyperinflation.

While the steel coins might be common, finding a large group of the non-magnetic LMD variety in consistent quality is becoming increasingly difficult for collectors focusing on 1990s Russian varieties.

Jimhek

Thank you for your feedback. I appreciate the clarification regarding the standard production methods for the 1992-1993 Russian issues.

However, my goal is to document this specific 'sandwich effect' as a significant technological variety of the transition period. While it is true that many coins from this era show a visible core, the specimens in my collection exhibit a particularly prominent edge plating exposure (blanking error).

 

I think you already documented it in this post. How else do you want to document it on the Numista site? It's very apparent already in the edge picture on the coin page.

Just to be precise, the exposed core is by design. There was no attempt to plate the core.  Maybe at most a design error but certainty not an error in the manufacturing of these coins.  These coins are clad, not plated. Plating is extremely thin like the US copper plated zinc pennies. They are plated after the blanks are made. Cladding is very thick, typically ¼ to ⅓ the total thickness.  Cladding cannot be applied after the blanks are made. This is similar to the US dimes, quarters, ½ dollars and dollars like this:

Not really sure what you're trying to tell us to be honest. The inner core being exposed is totally normal, clad coins just look like that, see any american quarter or dime, those are clad coins and you can see the copper inner.