Cigarette case / St.Petersburg maker's marks AK?

[Atlas]

So help would be once again appreciated with identifying the St.Petersburg (1899-1908 / A. Romanov) maker's marks on a cigarette case (, and I assume it is not Heikki Kaksonen / Heinrich Kaxonen ;-) ) if you please.

+ Would also be thankful with identifying the ( from most angles actually quite dark but gives a appearence to blue colour from certain angles) cabochè-stone acting as the opening button?

Regards,
~ Atlas ~

[Atlas]

9.5x9x1.5cm / 184gr.

[Aguest]

I would think the cabochon stone is a Sapphire, and although I can't see the vividness and translucence of the stone, you might want to research "Ceylon Sapphire" because this was a large source of sapphires at the turn of the century, it may be a Sapphire sourced from Ceylon (modern day Sri Lanka) ::

[AG2012]

Hi,
As far as I can tell, the only AK matching the Kokoshnik in St Petersburg was Alexander Karpov (Александр Карпов).
Except very prominent goldsmiths the push button was coloured glass.
Regards

[Atlas]

Thank you both for answers.
Regarding to Postnikova-Lodkova I also thought of A. Karpov.
( But regarding to Ivanov's book found quite a few other possibilities as well but since it has quite many mistaken information also, decided to ask opinion from the experienced knowledge of the forum as next step.)

Best regards,

- Atlas -