Identifying Gold Ring Markings: 750 M with Animal Head

Question
I recently acquired a gold ring. It is stamped with 750 as well as an M in a circle and what appears to be some type of animal's head with the mouth open, possibly a jaguar or a panther. The head is facing to the left. Could you please help me identify the manufacturer as well as the country of origin. Thank you.

Answer
There are thousands of these markings. The 750 means 18K The other markings are the country hall mark as you know.
Off hand I'm not familiar with that marking.

Good luck. Here are some links to help you out.
http://www.modernsilver.com/basichallmarks.htm
http://ezinearticles.com/?A-Quick-Look-at-Jewelry-Hallmarks&id=72739

http://ezinearticles.com/?Jewelry-Hallmarks&id=392386
http://reviews.ebay.com/Guide-to-Jewelry-Hallmarks-History-and-Meaning_W0QQugidZ...

In addition there are many hallmark websites to aid people in this task.
Sincerely,
Arthur DeMello GG (GIA)