Please help me find the author and the date of engraving

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Again I ask the head light to intervene. Solid mystery. In inete no hint of the author and portrayed. Premaxillary engraving. Sheet size 25,7 cm by 41,5 cm The size of the imprint on the facets 31cm to 19,8. Thin, grayish paper, such as Agate. Ie to the light and the vertical length between the short transverse lines, the structure of the watermark. My unprofessional assumptions: 1 Austria, Czech Republic, Germany?? 2 Judging from the nature of the wig and a simplified modeling of forms, lack of imitation of the material surface, as compared, for example with Wortmann, dare to sin at the end of 17 beginning 18. 3 Probably the shield in the center of the bottom, the documentary has a heraldic origin (?)
I'd love to hear the opinion of competent people: shy: