.925 Sterling 2 Tone Swirl Round Earrings Mexico

This is a pair of .925 sterling silver round swirl style post earrings with an additional metal color of brass or gold. I have not tested it. Condition - very good to excellent, a little tarnished. I have not cleaned these. There are 3 very faint dots on the gold colored metal on one earring. Only one earring is marked. Mark - 925, Mexico and TS-74. There is another mark but the first letter is worn down and unreadable as is the last letter. 1.25" Jewels3-4 Checked