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I acquired my Hall on eBay from Kurt Stone in 2008.
The Hall consists of a pulley sheave, eccentric cam, anvil, and two attachment eyes fastened between two 1.6 mm. steel side plates. The anvil is held in place by two round-head slotted bolts, while the other pieces are riveted in place. The pulley has a U-shaped groove sized for 10 mm. rope. The cam has four shallow grooves forming three distinct teeth. The attachment eyes do not pivot on their rivets. The Hall is 189 mm. tall, 86 mm. wide, and 29 mm. thick. Mine weighs 405 g.
One side is stamped with "TRADEHALLMARK" inside a diamond.
Can I resist calling this a Hall Hauler?
This looks like it was made as an item of farm equipment rather than a device for climbers or cavers. You can remove the screws holding the anvil so that you don't have to thread the end of the rope between the anvil and cam, but you will have to thread it above the sheave in any case.
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