How did people wear an antique watch with t bar?

The T-bar was slotted through a buttonhole on a waistcoat, leaving the chain to drape across the front with the pocket watch tucked safely into the pocket. Alternatively, many shorter chains and fancy link variations are adapted today to be worn wrapped around the wrist as a bracelet.

How can I tell if the gold is solid or rolled gold?

Solid gold pieces typically feature clear hallmarks indicating the purity, such as 9ct, along with assay office marks and date letters. Rolled gold items consist of a thin layer of gold bonded to a base metal core and generally lack these official precious metal hallmarks.

Can I still use these chains with a modern pocket watch?

Most antique dog clips and swivel rings attach easily to the pendant loop of any standard pocket watch. Buyers simply need to check that the scale and weight of the chain match the size of their timepiece.