Dad wrote:It is other mark. Other period of time.
Very interesting statement by you Dad, but you lost me now. Kindly tell me what other mark and what period would that be? A picture of an authentic mark would be much appreciated. To my understanding the "dvoinik" (double) poincon was introduced in three different shapes approx. 1882 (-1898), these two and the one already showed in oval shape:

I hope that you are not mixing Postnikova's very questionable picture "#2017 with the left one. Such a hallmark does not exist to my understanding.
Sorry about the ХИ mark, my misunderstanding.
The enameled pill box with the false kokoshnik is a very god example of a fake. Nice that you showed it to us Dad. And yes, many pictures in Postnikova are sketches or drawings only, especially the kokoshnik marks and other marks as from page 258 to 264.