Job Number 170124

Typical broken mainspring...

The mainspring called for is a 'T' end. It has a rod at the end that side in a hole in the bottom edge of the barrel on one side and the cap (shown here) on the other.

This is a Hampden 16 size, 15 jewels, model 4 made about 1910.

See the album for this project here.

And more Hampden examples here...