In reference to Michael Perchin, the date provided is not in keeping with workmaster Michael Perchin, St Petersburg, 1899 - 1903. The earlier date you cited I also believe could be the date the particular design of the mark was adopted by St. Petersburg.
It would be easier to first establish the authenticity of the MP initial marks. Without the benefit of a photograph it is impossible to tell. You are very welcome to upload a photo of the initial marks in a follow-up submission.