Did you ever receive information regarding your Peace rose understock? My Dictionary of Rose Cultivars defines Peace parentage as follows: ('George Dickson' x 'Souvenir de Claudius Pernet') x ([Joanna Hill' x 'Charles P. Kilham'] x 'Margaret McCredy').
George Dickson is described as velvety crimson, flushed scarlet.
Souvenir de Claudius Pernet is described as pure yellow with darker center, double, 30 petals, large, foriferous, bud long, pointed, growth upright, long stems, foliage glossy-green.
Joanna Hill is described as pale yellow, darker center, large, double, some scent, growth strong, foliage matt, medium.
Charles P. Kilham - no description.
Margaret McCredy is described as orange-scarlet.
One of these may or may not be your understock--all have their parentages as well, and so on and so on. The parentages of George Dickson, Charles P. Kilham and Margaret McCredy (in my older book) are unknown.
Hope this helps you!