English watch makings last hurrah! A Smiths movement for J.W. Benson.

 

And doing it rather well, this watch is within beat[1] to 0.07mSec or 0.03%.

This is a good quality movement for Benson by Smiths of Cheltenham who made limited quantities of good quality lever movement wrist and pocket watches on the back of their instrument and clock making business - particularly that of the long established aircraft instruments division and not to be confused with the Welsh joint venture that made millions of cheap pin lever watches from 1947.

Made in the Swiss style it has a Swiss Lever escapement with an Elinvar over-sprung screwed balance with double roller.

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[1] Being in beat means that the balance action is symmetrical swinging an equal distance in each direction and that the balance staff, impulse jewel and pallet arbour are in perfect alignment. If you think in terms of a long case clock the "tick" equals the "tock" and it has a steady rhythm.