No, I can't see a thing off those. I know where you mean though. I did think I'd found a pair of Celtic gateposts four or five years ago, under a hedge in Moss Bank Park, about this time of year. But they're Victorian - worth hundreds - and still there. Then there's a carved stone trough behind Johnson Fold School - six foot by three foot - that's worth a bob or two too. But we reckon that stone wall down that side of Harpers Lane is 1930's and constructed from the stone of a drystone wall that was there previously. In the local history newsletter - archived at Bolton Local Studies - there's the reproduction of an old photo that shows it. It's about as blurry as yours is !