Porcelain Valve disc with Peter the Great

[OlegTsi]

The figure in 1982 under the monogram suggests that 82 is the year 1882 and subtracting 200 is obtained 1682, the year when Peter became king. If so, then why all the image black. There was no hint of the 200 th anniversary on the plate no. All details are clearly defined and sorry, photos are not the best quality. This Valve disc was purchased by a collector in 1980, has since hung on the wall.
If anyone ever encountered a similar thing, respond and comment.
Thank you.