So i heard this sub likes skeleton watches.... The Seiko ref. Prclas666. A well known homage of Casio f91-w. Also known as the “Ghost alpinist”. Legend says the time is only visible
Casio F91W review - YouTube
Casio F-91W Classic Digital Chronograph Alarm Watch 593 | KeepTheTime.com
Casio F91W semi-Skeletonised with inverted LCD. : r/casio