Hm According to the Signatum thread it is a "fairly launched" coin  ...
OCminer listed the coin...
The coin is listed on exchange "cryptopia"  
And I noticed some sockpuppets of user "Digitalindustry"   (for the people who don't know who is "digitalindustry" https://bitcointalk.org/index.php?topic=781954.0)

I think I can add Signatum to my list. It would not surprise me if Signatum is from the same copy coin cloner:

https://bitcointalk.org/index.php?topic=1966967.0