I'm Irish and my mother often mentions an old aunt of hers back in the 40s / 50s at get-togethers would sing a song (a song, that apparently had 10 million verses, meaning everyone would roll their eyes when she did it as her party piece) about a blacksmith.

She remembers that the story in the song is about an illiterate blacksmith who in the chorus asks the local school teacher whose horse he is shoeing to "write a letter to my sweetheart fair".

She reckons that this particular aunt would have been fairly anglicised, so presumes it was likely an English rather than Irish song. I'd love to find it, just to keep the thread of history of what my relatives sang back in the day, but despite much-googling can't find this lyric anywhere. Does anyone know it? Could you give me a link or the title or anything at all?

Thanks in advance : )