A tighter date range (without reading date on the coin) is determined by the assayers names and term of service:
Assayers: FM= Francesco Arance y Cobos & Mariano Rodriquez 1789-1803.
Don.....
If the coin was dated 1807, the assayer's initials would have been TH.
But these are clearly FM.
Assuming the date ended in '7', that would give it a date of 1797.
The FM letters only appear on 1/2R MXC coins from 1789 to 1801.
Don.......
Trez,
In my book you are one of the best ID-ers of coins (especially cobs ).
Glad to have shared many years and continue to share with you the TN experience.
Don....