A tag and blank crest from Digimon Adventure (AKA Digimon: Digital Monsters Season 1).
The tag has guides for the crests to slide into, and they can be freely inserted and swapped. While only the blank crest is included, you can extend it by cutting one of the crest sigils into its geometry and extruding. Model has been tested on a 3D printer.
![](https://lh3.googleusercontent.com/_sE6GoByrZbcZyE9LiuZPgiWsrx4nLBt9IKHiJ-5lqRlgqh1y382tPP85RCBUoJp47R0oShw0QhQ9zI1i5WHSJnY2i_bBS6QcgE5HXkD4wgZVfmXmqkkE5rg0GTsGV-GTA=w1280)
(digivice models in photo from Hyperimus: https://sketchfab.com/3d-models/digivice-f9897ae8550b46e6a4cbf2f6ec7025d1 )