Swank Flat Optical Illusion Initial Letter P Vintage Cufflinks, Groovy Retro Cuff Links

Cufflinks have a fun optical illusion design that's fairly flat but appears to look like a cube from the front though it's not. Has the initial letter P on the front. 

• Size: 3/4" in size.
• Type: Pre Owned Retro Vintage from the 1970's. 
• Condition: Darkened patina with good working lever backs.
• Materials: Silver tone plated metal, paint.
• Markings: Marked Swank on the back.