I think you are referring to the "Knotmaster" log. Full name 'Thomas Walker Knotmaster Taffrail Log'

It was manufactured by Thomas Walker in the UK but is no longer made. There were, as far as I know, two basic versions....the KDO type and the upmarket one (whose initials I can't recall at this moment, think it may have been KDS). Both types came in wooden boxes complete with two spinners in the lid, two weights, instruction booklet, two fixing plates (port and starboard), the log head itself and the bracket. There should also be two trailing lines and an oil can!! The second version contained an additional 'dynamo' contraption which drove a seperate large speed dial, calibrated in knots.

If you can get a complete one on e-bay for Ł50, then you are doing well. They are sometimes sought after, particularly by Americans and are therefore usually expensive. I think the new price when last made was around the Ł350 -Ł400 mark. (I have both versions kicking around in my after cabin somewhere, both new, never used!!). Should you manage to get one, make sure the port & stbd fixing plates are there, they are sometimes hard to find.

See: http://www.robertwhite.com/cgi-local/sho...nav_bar=weather