Need help with makers marks - silver purse frame

[sln4tra]

I did some research and found that one of the marks, the one with 3 x's, was used in amsterdam from the 16th-17th centuries.
That's about as far as I was able to get, I appreciate any help I can get.

[oel]

Hello welcome to the forum,

The little dolphin mark, top left is known as the Dutch dolphin mark; the 1859 duty mark for new unguaranteed objects of national origin. This mark was used on all new silver objects below legal standard of fineness, those with non-precious metal additions, and on new heavily gold or silver plated objects, as long as the average precious metal content after melting with the base metal was at least 250/1000. This particular dolphin mark used until 1893.
The other marks are fake or pseudo marks from left to right: crowned O, pseudo duty mark, the letter T, pseudo date letter, the three Andreas crosses, pseudo city mark for Amsterdam, lion rampant (upside down), pseudo standard province mark and pseudo makers’ mark of Roelof Helweg.
Your purse frame is made around 1890, late 19th-early 20th century, a period when antique silver was in very high demand and copies of those antiques were flooding the markets.

For more information about Dutch marks; dolpin mark, duty mark, date letters, city marks:
http://www.925-1000.com/forum/viewtopic.php?f=5&t=32028
Dutch maker's marks and other marks:
http://www.925-1000.com/forum/viewtopic.php?f=5&t=28590


Oel.

[sln4tra]

Thank you very much oel!