Hmmmm... still an interesting "case". Kindly tell us what initials are above the year 1844. However, we have seen this mark before and assumed that it would be Dimitry Aleksandrovitch Polyakov, active in his workshop on Sretinskaya district, 1st block, 49 in Moscow around 1852. Goldsmith and merchant of the 3rd order.
Look here. Unfortunately the pictures hve been removed for some reason but read the text.
http://www.925-1000.com/forum/viewtopic ... kov#p80521