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Pocket watch mainspring


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Can anyone help with this...

I took an old pocket watch to a local watchmaker for a friend (I don't usually do repairs for other people, and don't have much pocket watch experience). It's a regular lever type movement, and I don't recall much about it now except that the dial is marked James Reid.

The watchmaker is struggling to find a mainspring for it as it's an odd size. I called in to see him today and he tells me the size is 5.4mm high, 10mm barrel diameter and 0.4 thickness. He was sorting through some material and had these numbers in his head so I hope they are correct, but I can't find anything anywhere near that.

If these are right does anyone have any good ideas where to find one?

Thanks

S

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