Necklace "Sujeta Mayúsculas" (Orange/Underwood)

This key belongs to an Underwood typewriter from the decade of the 20´s. It was in very bad state and some keys were missing on the keyboard. The process of restoration took a bit long yet the result is this stained and cracked paper that gives a very unique touch to the necklace. I love how every key is so different and personal. 

This key would be the equivalent of the Shift Lock in English keyboards, and it was used to lock the carriage so that you could type in Capital letters. What does it mean to you?