Toy windup key. Brass Metric square 2.50 or 2.75mm – Classic Tin Toy Co.
Wind up Keys - Etsy UK
Replacement Wind-Up Key fits Most Vintage Mechanical Toys FREE SHIPPING Best $$ | eBay
Antique Hornby Wind up Train Key and One Metal Wind up Toy Key Bundle of 2 Keys Collectible Rare Train Collectors Toy Wind up Collectible - Etsy UK | Toy keys, Wind-up
Vintage Clock Keys lot of 2, Wind up Keys, Skeleton Keys, Maker Supply, Steampunk Supply, Wind up Clock Key, Clock Wind up Key, Ships Free - Etsy UK
Nickel Steel Key Winding Key Tin Toys / Tinplate Wind up / Clockwork Trains & Models 2.00mm to 6.00mm - Etsy