Necklace "Sujeta Mayúsculas" (White/Underwood)

This incredible white key belongs to an Underwood from the decade of the 20´s. I love how delicate she is, with a very thin font and a shape that resembles more to an elipse than a circle. Most of the keys of this typewriter have dust inside of them, giving them a very antique look and making each and one of them really special. 

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?