Edited to delete links in duplicate .
Colors I have spoted are gray, blue, green, and red ( Fuoco ), all of them demonstrators.
Check photos and text from links bellow, in order to check if you pen matches .
LINKS :
https://www.worthpoint.com/worthopedia/ancora-cielo-blue-demonstrator-pen-458162709
https://www.worthpoint.com/worthopedia/ancora-cielo-demonstrator-fountain-1815717880
https://picclick.com/Ancora-Cielo-Demonstrator-transparent-green-limited-edition-of-143502053912.html
https://picclick.co.uk/Ancora-Red-Demonstrator-Fuoco-Limited-Edition-154-200-Fountain-164188812503.html
https://www.fountainpennetwork.com/forum/topic/262276-ancora-pens-from-italy/
Responses
www.newpentrace.net