Steve,
If you can, post a digital photo and here is how to do it:
1. At the bottom of this page you will see a "files" tab, click on it.
2. You will then see a tab labeled "upload new file" at the bottom of the page, click on it and follow the directions.
3. After you have uploaded the file you will see the filename appear on the page, next you click on the "info" tab and copy the full file URL.
4. On the menu bar above you will see a button labeled "insert image wizard" (it looks like a picture with a star on it) click it.
5. A new screen will appear make sure the source type is set to external URL image
6. In the "Provide URL" box paste your URL that you copied earlier and then click "insert code"
7. Your all done!
In regards to weight I have to ask the obvious first, is your scale calibrated? Hate to see you go through a ton of trouble for a simple accident. If it is calibrated can you post the grams weighed?
As far as types counterfeited more than others well thats a tall order. The most popular are silver dollars (Bust, Seated, Trade, & Morgan) but that does not mean there are not other popular counterfeits for many key date coins. For example a popular trick is to take a 1944D Lincoln cent and shave off a portion of the first 4 to make it a 1914D cent and then sell them for hundreds of dollars.
Personally, I've never heard of any counterfeit or modified 1798 large cent but anything is possible yet it seems unlikely (depending on condition) as the 1798 large cent is the most affordable of all 19th century large cent coins.
Until we get a photo theres little we can do from here
