Featured 18th Century Dutch Silver Bowl

Help please!!

I won this at auction (along with that big black silver vase). The description said it was an 18th century Dutch silver bowl.

While I don't doubt that it's both Dutch, and Silver, I don't understand how it was dated as 18th century. It certainly looks extremely bloody old, but that's about all I can figure. It's gilt inside, and has some lovely repousse work on it. The base is slightly cracked from age and it has hallmarks punched into the underside of the bowl...



I do not recognise any of the hallmarks. None of the websites I visited were of any help.

The one on the left looks like a Lion Rampant, with a C next to it. I believe this to be the fineness mark, denoting purity.

The one on the top looks like a crown or a shield of some sort. This, I guess, is the assay mark, where it was stamped and tested.

The other two (right, and below), I can't make out at all! I guess they're the date letter/code, and the maker's mark.

Help!!

 

Done a bit of research.

The lion rampant with crown (left mark) is purity for 93.4% silver.

I can't figure out the other marks though.

 

Could you post another picture of just the marks?

 

I shall try, but they're tricky to snap...

 

Here we are:

 

I think you may have a nice pre-1807 piece of Frisian silver, made in the town of Leeuwarden. Friesland is a province in the north of The Netherlands, Leeuwarden is the capital of Friesland.
If I am right, this is valuable, every silver collector in The Netherlands has to have at least one piece of Frisian silver.
Check this page, halfway down under City of Leeuwarden:
http://www.925-1000.com/forum/viewtopic.php?f=5&t=32028

Edit:
I was a bit hesitant in writing the above, because your piece, while nice, doesn't have the Frisian quality I am used to.
I did a bit of research, and it seems I am not the only one who came across this. A recent study found evidence that some Frisian silversmiths bought silver objects in Amsterdam and struck them with their own mark. Friesland was semi-independent at the time, and did not have the guild and marking control the other provinces had. Frisian silversmiths also struck their own guarantee marks at the time, so you may want to test the silver content.