View Message

"... probably not authentic."
I agree. If there was a Kallweit coat of arms (the crest is something different)it would have a good chance of being recorded in Rietstap's "Armorial ...", a French work. Here is the relevant page -
http://www.euraldic.com/lasu/bl/bl_k_al.html
No Kallweit, or Kalvis for that matter.