Silver hallmark identyfication

[madej]

Hallo.Please identify hallmark.
Click on the image for better qualitty

[Goldstein]

Hi madej -

Townmark: St. Petersburg
Assayer: Brandenburg, Eduard Fedor 1850-1866
Silversmith: Seipel, Karl Adolf 1820-1891 - known for his high quality

Regards
Goldstein

source: PL, pp. 179,188

[Qrt.S]

CAS is Carl Adolf Seipel a Finn born 17.8.1820 in Lovisa in Finland. He moved 1844 from Wiborg in Finland to St. Petersburg and became master 1846. He had his own workshop as from 1849 in Saltykov's house on Bolshaya Sadovaja uliza. Seipel died 20.2.1891.

[madej]

Thanks:)