This happens during the production process. The main reason is that the module is too small for stamping 925 or 990.
eBay
Portable Luggage Keys Practical Combination Lock Hardware Accessory TSA002 TSA007 Lock Key Multifunctional Customs
Aliexpress UK
Price is for ONE keyring.
eBay
Handmade white ribbon beaded keychain | Y2K Butterfly Star Keychain
Aliexpress UK
1 x Keyring. Hinged for Easy Adding / Removal of Keys. Secure Hinge Fixing to Avoid Loss of Keys. High Quality Construction and Nickel Plate Coating. Each Ring Holds Over 30 Keys. -Hope you can realize.
eBay
6 Pcs Cute Kitten Keychain Couple Gift and Cat Charm Key Chain Fashion Jewelry for Animal Lovers Car Bag Hanging Accessories New
Aliexpress UK
This brand new Legend of Zelda large heart container metal keyring is a stylish and practical accessory for any fan of the iconic video game franchise. The gold-coloured metal material gives it a sleek and premium look, while the detachable keyring feature adds convenience and versatility. Perfect for showcasing your love for Zelda in a modern and durable way, this keyring is a must-have for any enthusiast.
eBay
2PCS Small Item Portable Stainless Steel Keychain Heart-shaped Splicing Cat Yin and Yang Cat Pendant Necklace Keychain Jewelry
Aliexpress UK
Split ring set. Set includes.
eBay
Mini Animal Doll Series Crochet Keychain Knitted Small Rabbit Doll Keyrings Mini Puppy Cute Keychain Wholesale Custom Accessory
Aliexpress UK
A-Z initials letter keyring available in gold and silver colours.
eBay
Sunday Ice cream Soda Keychain / Cute jewelry charm bead / Sunday keychain / Kawaii / Coquette / Gift for her / Handmade / Y2K
Aliexpress UK
This keyring is suitable for pet collars, car fobs, and house keys, providing a durable and modern accessory for occupational use.
eBay
Small Solid Brass Locks with Keys, Mini Key Locks for Luggage, Backpack Small Locks, Gym Locker Padlocks, Jewelry Box Lock
Aliexpress UK
Choose your keyring finish and add your personalisation details at checkout. We will copy exactly what has been provided.
eBay
Commonly House used key blank FAV1D double slot key blank
Aliexpress UK