Just for fun.
2000 :
Australia, 50 pence - Royal Visit
1900 :
Venezuela, 1/4 bolivar
1800 :
Austria - 1 kreuzer
1700 :
Russia, 1 kopeck
The conversion of the date for this one is a bit tricky :
- The year is written in cyrilic numerals "CH" with a tilde above (on the observe).
- The "H" shaped character should be read as a "И"
- The date uses the old calendar here, so we should read "҂ЗСИ" instead (the "҂З" never appears on those coins but is implied)
- "҂З" = 7000 ; С = 200 ; И = 8 . That means this coins was minted in 7208 in the ancient slavic calendar.
- This calendar starts at 5508 BC (date of the "Creation of the World / Star Temple"), so we should retract 5508 to have the conversion in the Gregorian.
- 7208 - 5508 = 1700.
Fortunately, it's the last year minted with this calendar and we can find gregorian dates for the year 1700 as well (with the inscription "҂aψ" instead).
http://survincity.com/2010/09/ancient-slavic-calendar-data
I don't have any coins dated in 1600 nor 1500.
1400 :
Mamluk sultanate, 1 fals
Year [8]02 AH in the Hijri (islamic / musulman) calendar.
The date is written in full on the reverse side (left of the chalice : "ithnatain / sanat" in a simple and kinda degenerated calligraphy, as usual).
Another example here for this date :
https://www.zeno.ru/showphoto.php?photo=144588
It's a lunar calendar, so it doesn't perfecly fit in gregorian as the year started the 3rd September 1399 and ended the 22th August 1400.