Konstantin Maximovich Kolpakov, son of Vilnius
assayer Maxim Grigorievich Kolpakov, was born in 1842 and graduated
from the St. Petersburg Assayer’s School in 1860, upon which he was
appointed an assistant assayer in St. Petersburg. His first appointment
as a full assayer was to Kiev on 21 Jun 1862. However, within months,
on 10 Sep 1862, he was transferred to Kaunas/Kovno, replacing disgraced
assayer Feyodor Ivanov, who was found to have been smuggling gold
articles which he then illegally marked. Kolpakov remained at
Kaunas/Kovno without interruption until the 1896 re-organization of
assay office personnel.
Leizer Pinchusovich Scheinker was born in 1850 and recognized as a
master in the Vilnius Jewish Goldsmith’s Guild on 9 Jun 1874. He was
registered at the Vilnius Assay Office from 1877 to 1900 and is
recorded as having four apprentices 1883-1889.
This seems to be definitive: Kolpakov was assayer at Kaunas/Kovno
1862-1896, while Scheinker was registered at Vilnius 1877-1900. But I
concur with what everyone else has said: the dodgy look of the marks
and questionable workmanship are evidence enough that the buckle is not
Ref: Edmundas Laucevicius, Lietuvos
auksakalyste : XV-XIX amzius [Lithuanian Goldsmiths, 15th-19th
Centuries], (Vilnius: Baltos Lankos, 2001), pp. 382-383, maker
#II.952; p. 408-409, assayer #13.