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Your photos of the kokoshnik are not very clear( I'll be more polite)
Is it the first time you take your own, instead of using professional auction photos from the Internet?
It could be Konstantin Prokopievich Prokopiev. He was active in St Petersburg around 1910. However, I don't understand why P#1313 КП would be Ekatherina Yeremeeva Parkkinen? Her punch was ЕП in1892-1910 on Ligovskaya uliza 19 in StP. It must be one of the mistakes in Postnikova. I have to check it. I revert to this if something new occurs.