What type of clasps do vintage pins have? How can they be used for dating?

The locking C-clap was patented in 1901 . In 1910 it began to be used allot. What makes it distinctive is the spinning locking mechanism. This spinning lock makes it secure and prevents it from dislodging. This was one of the most popular clasp which is even sometimes today.

Then there is the plain c-clasp which is similar but it does not have the spinning mechanism.

The tube clasp was patented in 1850 and was used until after World War II. Europeans favored this clasp. The knob pulls out to release the long pin. This type of clasp is very useful in dating your pin.Pins with type of clasp are from the period of 1850 to 1910. Do not pass up these gems, they are old and collectible.

Another point of interest is to note the pin stem that sometimes is found to extend beyond the c-clasp . An extra long pin stem is sometimes an indicator of a piece of jewelry that is older.

Also older pins are many times molded in two or more pieces, then these pieces are held together with a rivet.