This 3D printed caseback opener created from recycled biodegradable plastic is the perfect tool for enthusiasts working on Omega sports watches. Designed to fit Professional and Pre-moon Speedmasters, covering movements from 321 to 3861 and lug widths from 19mm to 20mm, it ensures precise and reliable use. Its smart, stackable design allows for compact storage, making it an efficient addition to any toolkit. Beyond caseback removal, it also assists in bezel removal and 3861 Speedmaster bezel installation. At Spiralwinder Watch Parts, we’re proud to offer custom-crafted solutions that honor the heritage of your vintage timepieces.