I'd always pictured amputation saws with an elongated abd sloped blade, but wth Thackray Leeds it almost certainly is from the hospital. Medical instruments can fetch a lot of money, and I came across a Medical Instruments website a while back, generally all pre 1900, where they listed 'wanted' items, and some were in the $1000s .. but these were generally complete sets or rare pieces. Can't for the life of me recall what site it was, but they had a selection of these saws. Google Amputation Saws and I'm sure you'll come across it. If it turns out not to be too valuable then I'm sure the museum would love it. I'm not sure I'd want it in the house, I'd be dwelling too long on the poor souls who were under the knife, or in this case the saw.