Elgin Grade 206

These images show a mainspring in the barrel before cleaning. The old organic lubricant has become a gummy, green wax-like gunk.

Here's the mainspring and barrel cleaned and reassembled.

Here is the serial number stamp, under the balance cock. The prefix symbol resembles a logo Elgin used in later years.

The movement is Elgin's grade 206, 6 size, 7 jewels, made about 1901.