Hi,
From PL
Two Moscow silversmiths with BA initials:
2273 - 2274 Vasily Agafonov Semenov (Василий Агафонов Семенов) 1895 - 1917
Attributed to him:
2275 - Vasily Andreiev Ivanovich (Андреев Василий Иванович) 1908 - 1917
Attributed to him:
The third BA is 823 Vasiliy Antonov in Kostroma,Krasnoe village
(Василии Антонов 1890 село Красное, Кострома)
Comments from two Russian forums contradict in regard of BA attribution, but definitely Moscow.
Try Google entering their names in Russian and then add `` серебро 84 `` behind the name.
Regards