Featured Is this a dutch hallmark?

The photo is a bit blurred and some of those Dutch date letters of that period look very much alike to me. I considered an H as well, that would make it 1817.
I'll take a photo of the date letters later on.

 

What about the key intruding on the lion? Wasn't that "for export" indicator have been used some decades later than the 18-teens?

 

You are right, the key was used from 1853-1953 for new or 'unused' items for a partial duty exemption when exported from any part of the Kingdom of the Netherlands. Even if it was to another country within the kingdom. For instance you see it a lot on items that came from Indonesia to the Netherlands and vv.
Even personal items taken by a family from the Netherlands to the colonies, not meant for trade, would be struck for export. If the family returned, the key would be struck again, in exactly the same spot. In that case you will see that the key mark has a deeper impression than the lion mark.
It can also be seen on older items if they were old stock, and exported between 1853-1953.

The relevant date letters, They start with E. I hope they are legible.

 

Woot. great information, very interesting as old stocked items and export later.

And the date mark is a K as you said.

 

I am muchly jealous of those candlesticks...

 

I'm having a hard time seeing that mark as 1817 or 1819, would not expect to see either in an oval. Perhaps the maker's mark could be posted?

This composite shows the OP's mark, turned to the closest orientation I could see as correct for those letters, along with examples of the 1817 'H', and the 1819 'K' date marks:



~Cheryl

 

The two marks of "H" or "K" or something else are stamped in the exact same place, there's no any difference between them from what I can see.

Also I tried my best to take some more clearer photos.