Anyone know where these were minted

[mspence]

Or what the little one is 1784 Half reale??

 

[grasshopper]

tough to say on 2 of the mintmarks, but the one in the upper-left of your 2nd picture was minted in Mexico, as evident by the small "o" above the "M".

in regards to the size, take a look at the attached pic. Courtesy of Don in SJ, he posted it when I had a question about reale sizes a few years ago.

 

[Mackaydon]

1R is 20 mm; 2R is 28mm and 4R is 34mm in diameter.
Don....