If a Mercian then the frame no will be on the steerer assuming it's original. I don't think Mercian ever used Reynolds lugs?
Have the same heart lugs on my Mercian, never seen a Reynolds stamped dropout before, it's pretty.
@TheShipwright started
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If a Mercian then the frame no will be on the steerer assuming it's original. I don't think Mercian ever used Reynolds lugs?