I spotted this saw today amongst some tools for sale, judging by the narrow depth of plate, it's had a hard working life but I thought it is a Groves and it was cheap. Once I got home to have a better look at it I noticed that it is marked W R Groves rather than R Groves. I looked it up in BS&SM and found that it might be a bit of a rarity ( or it was when Simon wrote his book) with the only other known example being recorded in Canada. One line of thought suggests that saws marked like this one were produced for export. Mine was found in East Sussex so it's either returned home or it was sold here back in the 1860's ish. I'm going to have to keep looking for an affordable usable Groves tenon saw as this one deserves a gentle retirement.