20 Reales, Madrid, 1822 Sr

Actually in 1922 Mexico was already technically free from Spain (since August 24, 1821)

Any specialist here which would enlighten us on this ?
I suppose Spain still had many relations with Mexico - and mints may still be collaborating ... who made this design ? (Spain, or Mexico ?)
I don't have any coin from Iturbide (first mexican emperor before the republic) - does it have this same edge design ?

@MathieuMa:
The Iturbide coins still have the colonial edge design

Iturbide 8R have the colonial edge which immediately preceded it on Mex. coins - the circles & squares. The successor Central American Republic 8R also use the circles/squares, FYI.

Regarding the edge pattern on your nice Spain 20R (which is, of course, essentially and confusingly, a traditional "8R" called by a different name)... all of the Mex Cap & Rays pieces have some variation of an edge of brackets... but there is one particular mint that has almost EXACTLY that appearance, yes? I don't deal with them enough to know off-hand... I know Swamperbob has talked about the specific edges of each mint before. Anyone else know which mint that 20R most closely matches? There must be some direct connection regarding the technical aspects... Even though Mexico was breaking away from Spain, there would clearly still be significant commercial exchange between the two...

Thanks for posting that, BTW... didn't know those 20R used that edge. I had assumed it was the O//O//O pattern seen on the regular Spain reales coins (the based on 8 system).