Per the photo in the book, 'Rosa, Rosae, l'encyclopédie des roses', that flower is double, high-centered, and not single.

This rose is incorrectly described as a "single (4-8 petals)." The photos on the website of one of the two nurseries that sell it show that it is double, not single. See
http://www.swanes.com.au/catalog/product_info.php?products_id=85&osCsid=