with apologies to Ogden Nash...
The W would be for Whitworth fasteners?
This account says that Packard produced the Whitworth fasteners in-house because they were difficult to source in the US:https://www.jrcengineering.com/wp-content/uploads/2021/12/PACKARD-ROLLS-ROYCE-MERLIN-WHITWORTH.pdf
I Wonder what part of the engine the wrench is for. a large head but short handle for a low torque situation. The opening is as it says, 1.860", the designation is 1 1/8 W., so maybe? I'm surprised they used Whitworth at all in America but the link that Dave included explains that aspect. It's a good look at how the American interpretation of a British design worked. Thanks, Dave!
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