Precise 0.75mm flat band 20.13.160mm steel ball 7&8mm chronograph test.

Precise 0.75mm flat band 20.13.160mm steel ball 7&8mm chronograph test.
Precise 0.75mm flat band 20.13.160mm steel ball 7&8mm chronograph test.
Precise 0.75mm flat band 20.13.160mm steel ball 7&8mm chronograph test.

test.