Omega buckles are often similar in appearance, but each has its own special identifying features. For example there is no single manufacturer who uses the same signature or markings across all their products – which can make it difficult for collectors to identify exactly what they have in hand.
Omega forums member @omegastar collected Omega buckles for years and realised that identifying the differences was not as simple as he thought. That’s why he blessed the Omega community with an extensive thread on vintage omega buckles. All credits to Mounir (https://omegaforums.net/threads/about-omega-buckles.37347/).