The coin described and illustrated below appears to an overdate. Is this a known variety? 16mm 1.99 grams Copper The ‘1’ appears surface doubled at the top slanted down slightly for left to right; surface doubling also appears at the bottom. The ‘9’ appears to struck over and ‘8’ with evidence inside the upper and lower loops. The ‘0’ appears doubled at the outside upper left and inside the upper loop with a notch at the upper right and a spike at the upper left. The ‘7’ appears doubled below the crossbar and it also exhibits a small downward pointing cylindrical spike at the bottom left end of the crossbar.
Photo is a screen shot from ngccoin.com. There were over dates, they just don't show one for 1907. It would make sense that they would exist. IMO
You're not looking at the re-use of a hundred-year-old die. If I understand it correctly the die would have been made with just the first two date numbers so that the last two numbers could be added at will. Consider the 1902/801: Come the turn of the century, an 18xx die was re-cut to make 19xx. Then the last two date figures were added, in this case 01. The 1 was subsequently recut to make a 2. I am happy to be corrected but I think that's about right.
Since Belgium did not exist as a nation in 1807 they were hardly likely to mint one cent coins with that date.
What is likely the case is that there might be some left over dies in the 1890s with the last two digits not engraved. Thus the second digit was reengraved, causing it to look like it was overdate over a 100 year old die.
With a bit of re-engraving at the bottom of the '1', re-punching of the '0' upper left and center, and re-engraving and re-punching of the '7' at the bottom of the crossbar, a late die state example of the coin in hand appears plausible?