Book  (Oct 2001)  Page(s) 247.  Includes photo(s).
 
Clematis 'King Edward VII'
George Jackman and Son (England) 1902
C. 'Fairy Queen' x 'C. 'Sir Trevor Lawrence'
... single, rather large, rose-pink flowers... The unique colouring of the tepals gives them a mottled effect, fading outwards to deep mauve at the margins and sometimes to white at the tips...

Website/Catalog  (1912)  Page(s) 78.  
 
Summer and Autumn Clematis.
In bloom from July to October.
These flower upon the wood of the current year's growth, and should therefore be pruned to five or six eyes.  
King Edward VII, large pucey violet, with bar of crimson down the centre of each petal, very fine; new...  2s. 0d

Website/Catalog  (1907)  Page(s) 65.  
 
Clematis in pots to plant out in spring and summer.
New Varieties.
36a King Edward VII, puce violet, bar of crimson down each sepal.