Fake British No4 MK1 cruciform Bayonet?

[Peter Laidler]

To answer the question of whether it has been refurbished or rebuilt at a workshop or not, we just need a simple answer to a simple question.
Have the original marks been machined off and hese new marks re-engraved? A simple check with a micrometer will answer yes or no!
If yes, then it's simply been refurbished. Although why anyone would even dream of machining off and re-engraving the same marking on is a more difficult question to answer.
Simple metallurgy will tell whether the steel spec is what it should be. Those two cheap and simple tests will be all that's needed

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[Flying10uk]

Is anyone able to tell me what the dimension across the socket width would have been when the bayonets were new before leaving the factory and before any refurbishment has taken place. Careful measurement with a micrometer on a number of No4 spike bayonets in my collection which I don't believe have been refurbished would seem to suggest a size of .875'' with a tolerance of perhaps +/- .005''. Would the tolerance have been tighter or more open than this? Does anyone happen to have an original factory engineering drawing by any chance, please? I thank-you in anticipation.