HELP NEEDED FOR IDENTIFYING TAXCO MEXICO BROOCH MAKERS STAMP

[cath1971]

Hi

Can anybody help me identify this makers stamp?!

It is on a large silver taxco abalone, enamel & granite flower brooch.

The marks I can work out are taxco 925 mexico..these are in a circle but within the circle are the initials of the maker which appear to be JO??

There also appears to be the eagle mark no 3 in the centre of the brooch.

Can anybody help me to identify the maker and what age this brooch may be?

Very kind regards

Cath
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