Oilpainting of Holy Trinity Church in Stratford-upon-Avon

We got this painting from my husbands co-worker, who's around 60 years old.  He got it when he emptied his moms house, it comes probably from his grandparents or greatgrandparents.

It 's the Holy Trinity Church in Stratford upon Avon.  It's oilpainting or on board or on canvas glued on board, not sure about it.  It's a hard material, dishshaped mold, maybe papier mache or plaster.  Diameter of the painting is 13,50".  The frame looks very old.  On the back under the ripped paper is a tag 'patented August 31 1880' On the paper is 'Stratford on Avon painted by Galley or Salley S Wall or Well.  I couldn't find anything concerning this name on internet.  I don't see any signature on the painting itself.