British Registered Design RD474176 This pendant top, registered in 1912, features a cloisonné crest symbolizing Windsor Castle. It has a multi-layered structure with a built-in celluloid memo insert from the time. When shifted, three celluloid plates appear, allowing you to write on them with a pencil, making it a rare and interesting item not found in modern times. In those days, it was mainly used for travel souvenirs, commemorative items, memorials for the military, schools, and city crests, and for writing the names, dates, and prayers of loved ones. The size is 3x3cm, weighing 13g. The word "WINDSOR" is on the front, but it is not an official crest. AI analysis suggests it is a "design crest" that reconfigures the royal image centered on Windsor Castle for tourism and souvenirs. This is an item from my grandmother's belongings and is a used item, so please understand this before purchasing.