KM trousers, RBNr.

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I've had these for a few years or more, they were part of a lot and I am thinking of selling them so I would like opinions and a valuation. I know people don't like to give values, but it would just allow me to put them on e-stand for a reasonable price. I thought c£100-200, but would appreciate a narrower range of value ( or a higher one?, maybe not). Do the theatrical suppliers stamps devalue them by a lot?
They have clear size and RBNr. stamps and are in a reasonable condition. I'm not sure but I think they might be missing a button.

Thanks in advance, JerryBB

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and another pic

more pics to follow

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and another

thanks, still more pics

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and the size and RBNr stamps

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Anyone?
Thanks,

Jerry