The product shown is a dark green crocodile or alligator embossed leather watch strap. Such shiny replacement bands are a classic accessory, giving wristwatches a sleek and luxurious look. They are from different manufacturers for different watch models (such as B. Cartier or Chopard) available.

Material: Genuine leather (often cowhide or calfskin) with an embossed crocodile texture.

This confirms that the band is made of genuine animal leather and not synthetic leather. The light, rough underside (lining leather) ensures a comfortable fit against the skin. 

Size: The number 18 is embossed at the end of the band, which represents a bridge width of 18mm.

Colour: Dark green / fir green with a glossy finish.

They typically feature a gold effect pin buckle.