Book  (1990)  Page(s) 57.  
 
Unique Moss. Robert 1852... cerise-purple, double, sometimes have white shadings...

Book  (1936)  Page(s) 719.  
 
Unique (moss) Robert 1852; blackish crimson-purple, spotted and mottled white and violet, medium size, double, rosette-form, once-blooming, growth 7/10. = Unique nouvelle.

Magazine  (19 Aug 1911)  Page(s) 404.  
 
The Parentage of Roses.
The following list of the world's Roses and their parentage has been compiled by Mr. Robert Daniel, 38 Russell Road. Fishponds, Bristol, and by his kind permission we are enabled to publish it...
Unique... Moss, Robert, 1852, Sport White Provence

Book  (1899)  Page(s) 175.  
 
Unique, centifolia muscosa, Robert, 1852, cramoisi noir, syn. Unique nouvel.
Unique nouvelle, centifolia muscosa, cramoisi marbré

Book  (1880)  Page(s) Annex, p. 130.  
 
moss, Unique, Unique nouvelle (Robert, 1852), purple-carmine, mottled with white and violet, large, full, rosette-form.

Magazine  (Sep 1878)  Page(s) 203.  
 
The Moss Rose (Rosa centifolia muscosa) is supposed to have originated from an accidental sport of the common Provence, and this supposition is strengthened by the fact that the seed from Moss Roses often produces plants having flowers entirely free from moss.  The earliest account we have of the Moss Rose is that it was imported from Holland to England in 1596.  The following varieties may be ranked among the best in this class:
Unique — Flowers pure white, large and full, habit vigorous. 

Book  (1875)  Page(s) 207.  
 
Moss. Unique Nouvelle; flowers crimson-purple mottled.

Website/Catalog  (1861)  Page(s) 60.  
 
Moss....
187. Unique (Rob.), medium size, full, purple-crimson, marbled with white and violet spots.

Book  (1853)  Page(s) 10.  
 
The Moss Rose.
128. Unique; flowers crimson purple, spotted with white. Raised at Angers. Introduced in 1852.

Magazine  (1853)  Page(s) Vol. 4, n.37, p. 288.  
 
Cultures de 1852 .... Culture de M. Robert,  horticulteur, successeur de M. VIBERT, rue des Bas-Chemins, près le Mail, à Angers.
Mousseuses ....  Unique.  Six à sept centimètres, pleine rouge-pourpre-cramoisi, marqué de points blancs violacés; à rosette. Unique encore pour sa couleur dans cette catégorie.