1973-D US Penny On A Canadian 1 Cent Planchet

This is from chatgpt. The compositions are very similar, an XRF may be the only way to tell if it's Canadian or not.

U.S. 1973 Penny ( Lincoln Cent)

• Composition: 95% copper, 5% zinc.
• Weight: 3.11 grams.
• Diameter: 19.05 mm.
• Thickness: 1.52 mm.

The U.S. penny was composed mostly of copper until 1982, when the composition switched to copper-plated zinc due to the rising cost of copper .

Canadian 1973 Penny

• Composition: 98% copper, 0.5% tin, 1.5% zinc (bronze).
• Weight: 3.24 grams.
• Diameter: 19.05 mm.
• Thickness: 1.65 mm.

Possibly an ingot roll meant for Canada's mint was marked/sent for the US by an outside supplier, both ingots would be very similar and they're neighbors.

Few more pics. Calipers measurement and photo of it next to a 1951 Canadian penny.

pdzl,

If all measurements are accurate, I agree with a rolled thick planchet.
If you feel you need to send it in,send it to ANACS they chare the least. I would not send it in though. Your first step would be an XRF test.
Here is a link on coin weights:https://www.coincommunity.com/us_co...lerances.asp
John1

to the Community!

to the CCF and rolled thick planchet. Just at the low end of being too heavy. My thought, enough to be collectable.

Ok so I've now gone back to leaning towards a Canadian planchet or at least a different composition. I did a ping test on it and get 13600 hz. Did some analysis on chatgpt and it lines up with a Canadian penny and appears virtually impossible to match a U.S. penny composition. I'm considering sending to anacs.


Let's adjust the analysis considering the correct weight of a **1973 U.S. penny** at **3.1 grams** and the proper composition of both coins.

### Composition and Weight Details
1. **1973 U.S. Penny**:
- **Composition**: 95% copper and 5% zinc.
- **Weight**: **3.1 grams**.
- **Expected Frequency**: For a typical 1973 U.S. penny, the frequency range can be estimated around **12,000 Hz** to **12,800 Hz**. Given the increased weight of **3.31 grams**, the frequency might rise due to the added stiffness.

2. **1973 Canadian Penny**:
- **Composition**: 98% copper, 1.5% tin, and 0.5% zinc.
- **Weight**: **3.24 grams**.
- **Expected Frequency**: The expected frequency for a standard 1973 Canadian penny would be around **12,800 Hz** to **13,500 Hz**. With a weight of **3.31 grams**, this may increase slightly.

### Frequency Analysis for 3.31-Gram Planchets
With both coins adjusted to a thicker planchet weight of **3.31 grams**, we can estimate their expected frequencies:

1. **1973 U.S. Penny** (3.31 grams):
- The increase in weight could yield a frequency around **12,600 Hz** to **13,200 Hz** due to the rigidity from the added mass.

2. **1973 Canadian Penny** (3.31 grams):
- Due to its denser composition (with tin included), the Canadian penny may produce a frequency closer to **13,000 Hz** to **13,700 Hz**.

### Summary Table
| Coin Type | Weight (grams) | Expected Frequency (Hz) |
|--------------------|----------------|-------------------------|
| 1973 U.S. Penny | 3.31 | 12,600 - 13,200 |
| 1973 Canadian Penny | 3.31 | 13,000 - 13,700 |

### Conclusion
The higher frequency expected from the Canadian penny is likely due to its composition, while the U.S. penny's frequency remains slightly lower despite the increased weight.

If you're conducting a ping test and observing frequencies within these ranges, it might suggest the nature of the planchet used. The composition differences, particularly the presence of tin in the Canadian pennies, could significantly impact the acoustic properties, leading to higher frequencies in the ping test.

### References
- [Coin World: U.S. Coin Weights and Measurements](https://www.coinworld.com/news/us-c...easurements)
- [The Royal Canadian Mint: Coin Specifications](https://www.mint.ca/en/home)

Let me know if you need any further information or analysis!

I found a 1973D penny that weighs 3.24 grams did you get yours certified? Mine is thicker and in good condom.