Check out the OS historic mapping at a suitable scale available as reproductions from Godfrey Edition maps at 1:2500.
Another useful source is the National Library of Scotland website, the collection of maps has been digitalised and is available on line. The collection can be viewed in a variety of ways and can be zoomed in and printed in small sections of interest which can all be done at various scales. The OS scales that show Bench Marks are
1:2500, 1:1250, 1:500, or 6″ to a mile