wats this mark mean ?

[aa battery]

gold

 

[GpSnoopy]

With reference to HOBCO jewelry only, I've seen examples that were gold plated, as well as gold washed and gold toned. They also sold charms and pendants separately, so that chain could be from a different manufacturer. It would be interesting to see what markings are on the chain/clasp, as bch suggested.

 

[aa battery]

 

[Sterling]

I noticed the links are not solid on the chain, so may not be silver or gold, you can always have it tested.

 

[Bigcypresshunter]

We are referring to the mark circled in red. It appears to be a 3 digit number. These numbers are often used to identify gold or silver fineness but the image is hard to see. I am wondering if its connected to the chain. Is it a number? Is it connected to the chain?