Vintage Swank Cuff links 1950's Original box

These cuff links were made by Swank, they are silver tone and have a small black stone on the face, there is no labeling for the stone, but it looks like an opal. They come in the original box and it is apparent that it was a set with a tie clip, but the tie clip is missing. The box is tin covered with black paper and there is a rust on the tin and some damage to the paper. The original tag is still attached and is $1.59, which in today's money is approximately $ 17. 0.8 x 0.5 inches