The spring ring is easily the most straightforward way of affixing the pocket watch chain towards the wearer's outfit. It's a more contemporary type of connection compared to t-bar, and it was initially mounted on a buttonhole (on the vest or shirt) or accustomed to attach the chain to itself after being looped round the wearer's belt. Using the spring ring to connect straight to a belt loop is a much more recent application.
A few of the bigger spring rings have a "chain guard, " that is a protrusion that stops rotation from the ring within the buttonhole, or functions to help keep different accessories separate around the ring.
Around the middle photo example below (in which the spring ring is attached straight to the wearer's shirt), the "drop" is really a slide around the primary chain (which forms the 2 "arms") within this circumstance, the arms are intended to be of equal length (shaped) towards the two pockets.
The t-bar, designed to be undergone a buttonhole, may be the earliest type of link between the pocket watch chain and also the wearer's vest or shirt it predated the spring ring as well as other clips used later on.
Fancy or ornate t-bars are usually worn from inside-out (to create visible and display the t-bars) standard t-bars are often worn outdoors-in (so that they aren't visible, as seen below).
The lobster-claw style clip is an extremely modern type of pocket watch chain connection, because it was introduced well following the t-bar, spring ring, along with other belt clips. This kind of clip is most frequently accustomed to attach the chain to some belt loop, as pictured below. In cases like this, a pocket knife continues to be connected to the chain's drop.