| Shape | Rectangle |
| Main Stone Creation | Natural |
| Color | Black |
| Main Stone Color | White |
| Metal | Unknown |
| Materials Sourced From | Unknown |
| Jewelry Department | Fashion |
| Vintage | Yes |
| Main Stone | Pearl |
| Brand | Unbranded |
| Department | Men |
| Type | Cufflinks |
| Unit Type | Unit |
| Main Stone Shape | Round |
| Original/Reproduction | Original |
| Style | Bullet Back |
| Country Of Origin | Japan |
They have black backgrounds, and each has an inlay of a small half-shell (mollusk?. and pearl. Set in clear resin / acrylic. Likely 1960s era. ).