Hello,
Can someone help me identify these marks?
All three appear on the edge of a thick plate. It’s about 8" across.
Thanks beforehand.
Jerry
Your marks resemble Spanish Colonial marks.
The top mark looks like the mark of Mexico Chief Assayer Antonio Forcada Y La Plaza (1791-1818).
Your bottom mark is damaged, actually was a crowned M quality mark.
Lots of reproducyions were made of early Mexican silver.
Can’t say for sure that your marks are authentic.
To my untrained eye, they look like the real thing.