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Hi
Letters in maker punch are П.М (P.M lat.). The letter "M" is performed in Church-Slavic font.
It's can be Пётр Милюков Pyotr Milyukov (Moscow).

Or can be anybody still ...))

Hi

It's not baron. The nine tines in the coronet indicate Count.

Coat of arms of Counts Musin-Pushkin. ( https://commons.wikimedia.org/wiki/Cate ... in-Pushkin )

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Two pictures for illustration:

Have managed to acquire this Icon, I believe that the maker is Alekseì V. Stepanov, St Peterburg 1890, the the assay master being Aleksandr Timofeyevich Shevyakov, my only query is that from my records this is not in his date range of assaying, however I have found that the (in my pubilcations) rec...

Hi
This fork was made by unknow maker "ИЦ". I think this maker from Odessa. 1914.
Соломон Гробдрук (Solomon Grobdruk) - was jewelery dealer. Perhaps he from Kishinev.

Production by “Лен.Юв.ф-ка”

Лен. - Ленинградская (Leningrad)
Юв. - ювелирная (jewelry)
Ф-ка - фабрика (factory)

Hi.
Yes, Matvei Sergeyev worked in Vyatka too. Matvei Sorokin worked before him (in Vyatka assay office)

I can add that Matvei Sorokin never worked in the Minsk Assay Office.
Short time (1874-1877) assayer Matvei Sergeyev worked in Minsk Assay Office (after Yaroslavl) .

No problem. Your right is use of all sources in open access.
I ask about other (various) sources, which you noted.

Ubaranda wrote:
Hello!
Information about Frolov and Ushatov is correct.

Hi. Tell me, please. Where you took information about Frolov and Ushatov?

Hi.

About "Z".
Such punches meet not seldom. Letters or figures. It belong to technological process. Are used for marking of parts, lots and etc.

AG2012 wrote:The assayer MK was Mihail Karinsky PL 1165 and 1166.
In office 1825 - 1838.

In 1838 year Karpinskialready did not work at the Petersburg assay office.
Dmitry Tverskoy replaced Karpinski in February, 1837. ))

Qrt.S wrote:In addition, most likely the customs brought it there. In other words an imported object.

Qrt.S,
You are incorrigible (((
It is the wrong conclusion. See above.
The customs at that time sent nothing to an assay office. The customs had no such duty.

About "import". I think, it is necessary to divide concepts. There is import of products for sale through customs. It is official import with the corresponding procedures and attributes. But, silver products can be brought (from foreing) privately, as personal, own. Then, it was brought in...

@Dad, Unfortunately I cannot find/I don't have the Decree 7517 of February 22, 1732) where it is stated that the silver fineness could be 75 zolotnik. Nonetheless, 75 was applied for gold coins only (1718). During the 18th century there was many "standards" for silver 62, 70, 72, 77...The...

AG2012 wrote:......But, were the measurements so precise at the time ?
......

It should be noted that St. Petersburg the assay office was created on the basis of the new St. Petersburg Mint. The St. Petersburg experts were the best.

Hi It is made in Hamburg during earlier period of time. Then, in the 1770th the Petersburg assay office marked it by russian punches. 75 – it is purity of silver (zolotnik). (Decree 7517 of February 22, 1732) At this time (1770th) a usual set of punches guaranteed the minimum purity of silver - 72 z...

Dear Ort's. Why you argue? I thought that you already accepted the fact: in 1882 the hallmarks of the Russian Empire was changed only in additive of "notches" in an old type of marks. And now you forgot again?)) Assay Law of 1882 told about marks for import silver very little. I don't know...

Yes. Qrt.S are right. It's russian import mark (84, eagle,ПТ). But, period before 1882.
"Eagle" - assay office mark. Most possibly it is Warsaw.
Country of producing was Germany. ( most possibly)

Best Reg...

Hi. These was made by factory of Nikolay Efimovich Shebanov (Николай Ефимович Шебанов ). Moscow. Factory was founded in 1830. Main products was the samovars, tea sets, etc.., produced by silverplate technic. "Silverplate" is russian "Накладное серебро" ( Laid silver (Cover silver...