I believe it is the logo for Pacific jewelry manufacturing co, who produced fine quality jewelry in the 1960s. They were based in California, and closed in the 70s.
SKAL is the mark of Skalet Manufacturing Co. Inc. New York, makers of gold jewelry findings in the mid to late 20th century.
NF 925
The mark EF Ltd is a makers mark. It identifies the company that made the ring. Also look for a 10k, 14k or other mark identifying the karat. Usually inside the band. A mark like EP or GS would indicate a gold plated ring.
GA is proablbly the makers mark or Sponsors mark as its known.
The Wh is the makers mark. I don't know what company it is. But I know that some jewelry makers put there mark next to the karat of the gold.
MJ likely stands for the initials of the manufacturer or designer of the ring. It is common for jewelers to include their initials or logo on jewelry pieces as a form of identification.
The "S" stamped after the 14k on your gold ring likely stands for the manufacturer's symbol or a specific identifier for the company that made the ring. It is common for jewelry makers to include their mark on the pieces they create for authentication and tracking purposes.
GB can mean the following: Gold bond, which in case it is less than real. It could also stand for the makers mark or a specific hallmark relative to the country the ring was made.
gold ring stamp with 14KIN, what does that stand for?
Some jewelry makers will simply stamp their "makers mark" or initials on jewelry. Examples include tiffany...oac...or mr we...versace etc....
417 = 10k gold. AV is likely the makers mark. Assuming you are seeing this on a ring or other pirce of jewelry.
GOLD SHELL = Equals fake or gold plate If the GS stamp is inside of a diamond shape it's the makers mark for Gottlieb & Sons.