Russian cigarette case - master?

[plxsh]

Hi,
Can someone help identify the master and the period it comes from and read the engraving?

[Mart]

Hello! Made in Moscow in 1908-1917, possibly before 1927. Unfortunately, the name of the silversmith is temporarily unknown.

[plxsh]

Hello! Made in Moscow in 1908-1917, possibly before 1927. Unfortunately, the name of the silversmith is temporarily unknown.

Thanks. Any ideas about engraver? Is this NP or DR? maybe Cyrillic?

[blakstone]

Of the four makers with these initials listed in Ivanov's "Gold and Silversmiths in Russia", the only one working in Moscow was Nikolai Pavlovich Shishkov: "owned a gold and silverware shop, mentioned in 1913. Moscow"

[plxsh]

Of the four makers with these initials listed in Ivanov's "Gold and Silversmiths in Russia", the only one working in Moscow was Nikolai Pavlovich Shishkov: "owned a gold and silverware shop, mentioned in 1913. Moscow"

Thank you so much