For an experienced collector, this watch chain is exceptional in several ways. First, it is progressive, meaning that the size of the links gradually increases towards the center and then decreases again. For the jeweler, this is a manufacturing feat, as this model is much more difficult to create than a regular chain. Additionally, it features a remarkable 75 hallmarks! Each link is marked with a lion, and there are many other hallmarks present on the additional pieces.The length of the chain is 36.5 cm. Professionals use a stone called a "touchstone" to determine whether a product is made of genuine sterling silver or not. The principle behind this touchstone is based on the reaction between silver and a mixture of 2/3 nitric acid and 1/3 hydrochloric acid. If it is silver, the mark will turn red. Multiple marks must be made in the same spot on the object to ensure that it is not simply silver-plated. Anyone can acquire this stone. This object has been tested multiple times and in different locations using this kit, confirming that it is indeed made of solid silver.