J.W. Benson "The Keyless Ludgate Watch" , 13J, 1891.

Here is a rare survivor. It is an early version and incorporates the Benson Patented integrated dust ring shown here in the case to which it is secured with three cams. The dust cover hinges from the ring rather than the case.

The 8 guinea starting price for these watches in silver is the equivalent to just under £1k in todays money but it was advertised as "The best and cheapest Keyless English Lever Ever made at the price".