It is a draped bust, made from 1795-1804. How can I reveal the date, I already cleaned it off with soap and warm water (this photo is pre-cleaning, as the obverse did not change much, while the reverse became much clearer)
More photos of this coin and the rest of the rare coins in my collection are here: https://drive.google.com/drive/folders/1PO_om90rMWwJGMwglRfueA4bOxvdVpcV?usp=sharing
Draped bust cents were minted 1796-1807. Cents with this much wear and porousness can be difficult to date. This coin might have spent some time in the ground. Others might chime in about bringing out the date. You might try to see if there are any identifying characteristics that might point to a specific year. The series has multiple varieties over the years.
I couldn't find any specific data for differences by year... I washed it with soap and warm water, but I have no other ideas.
Try this link as a starting point. There are some links and photos of the various varieties. For example your coin has stems on the bottom of the reverse wreath, so you can rule out those coins that are stemless. The reverse fraction seems correct so you can eliminate the 1/000 variety, and so on. There are other online resources as well. It will be a bit of a detective job. https://www.pcgs.com/prices/detail/draped-bust-cent/660/most-active
I've been using this, comparing berry, leaf and stem positions, and it looks to be the last one, the reverse of 1797.... which was used all years 1796-1807, sooooooo no help there. I still can't tell though, some parts of the other two varieties look very similar, like the stem angle and the leaves/berries/stem pattern on the right side... https://www.usacoinbook.com/us-coins/1796-1807-reverse-varieties-draped-bust-large-cent.jpg The stem angle doesn't look quite right, because there is a gap between the knot of the bow and the stems of the branches in the 1797 version, but not on my coin.
I'm fairly sure this is the same coin I saw posted on another forum, it has type 2 hair so it has to be after mid 1798. The reverse I am fairly sure is from the hub that was used from the last half of 1798, all of 1799 and 1800. Without a lot of work I can't get closer than that. I can say it isn't a 1799 though.
