Next challenge: Post your oldest coin showing a globe or other indication of a round Earth.
1) Globes, pictures of Earth from space, maps showing curved lines of latitude and longitude, and anything else that shows the earth as round is allowed.
2) Normal circulating coins, NCLT coins, notgeld, with a written or unwritten date are allowed. Not allowed are tokens, fantasy coins, medals, banknotes, stamps, private/non-government rounds, patterns, checks, pre-coinage items (like knives, shovels, cowrie shells), etc.
3) The date range that the coin was likely produced counts, whether or not it is written. Some reputable (and reasonably modern) reference book should be used to establish the date range. Dates are converted to the usual AD/BC scale.
4) One point is awarded for the last year of the date range when the coin could have been produced. BC coins get a negative number of points. The coin with the fewest points (perhaps the most negative) wins this round. Example -- coin was produced from 40BC to 13BC, gets -13 points.
5) The year when the coin was actually minted will override any dates written on the coin. (The actual production years for dated restrikes will count, not the date on the coin.)
6) Coins dated after 2019 will get 2019 points (unless it is known that the coin was produced prior to 2019).
7) Posts with a coin not showing a globe/map/etc. and posts with no valid coin will receive 2020 points. These will count in the leaderboard. The first one of these posts might win, if nobody posts any valid coins for this round.
8) There is no bonus for an exact match.
9) In case of a points tie, the earliest post wins
10) If one poster submits multiple entries, only the one with the fewest points will appear in the leaderboard.
11) Cutoff for entries 17:30 forum time, 2019/12/14.
United States -- 50 cents, 1892:
Colony of Angola -- 1 macuta, 1814: