The standard Altsha watch buckle in polished, matte, black, gold and rose gold, in 12mm to 22mm buckle-end widths.
A rolled bar and a pinned tang, the frame fitted to most of our straps. The PVD finishes are a harder surface than plating and hold their colour at the corners, where a buckle takes its wear.
This is the frame fitted to most Altsha straps, so the usual reason to buy one on its own is to change a finish rather than to replace a part. A rolled bar, a pinned tang, and a tang cut for the standard round punch, which means it fastens on any strap punched the ordinary way. The field and Pre-V frames won't.
Polished stainless is the safest match for a steel case. Matte stainless is the same metal without the polish, a shade darker and easier beside a brushed or bead-blasted case. The other three are PVD over stainless: black for a blacked-out watch, gold, and rose gold for a red-gold case or for bronze that has started to turn. All five come 12 to 22mm at the buckle end.