I just had a look at W&B's website. I would hardly suggest the dark ages.
They still make the same deflecting beam, due to it standing the test of time.
It has the equal highest accuracy of all their wrenches and as a bonus is still made in Oz.
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Might have been poor choice of wording.
Main question was who has had one in regular service for years, and if so what's its accuracy like now?
Trying to work out how inaccurate these things become when they see many years of service without the level of maintenance the manufacturer may stipulate... as I'd more likely than not be looking at a higher qualitiy, used wrench.
My father has a W&B deflection beam TW that has to be 30+ years old, is used regularly and has never been recalibrated. I recently purchased a brand new one. They appear, as far as I can tell, to give identical results when tested back to back.
When I researched a TW everyone was saying get one of the ratchet jobs. My first mistake was buying a Kingchrome, which might be a good wrench but I find the setting values impossible to use. Partly because my eyesight is a bit poor but even with glasses the damn thing is hard to see and complicated to set. It sits in the cupboard now, having made me bust an injector stud.
I went with the W&B deflection beam as it was my understanding from research at the time that it is the only type that remains accurate without the need for periodic recalibration. I could never be bothered getting a TW recalibrated so it was the jigger for me. Helps that the settings are easy to read and easy to set.