This is a reprint of an advertisement from the May, 1886 edition of Jeweler's Circular. It describes and touts the virtues of the "Teske's Patent Regulator" which could be fitted to many American pocket watches as an upgrade by jewelers and watch makers. I have reprinted this as a supplement to the November, 2001 "Interstatetime Watch of the Month", an Illinois Bunn with a Teske Regulator. Thanks to Greg Frauenhoff for submitting this ad for display on interstatetime.com.