Hello,
I received a gift from friend and I wonder what period that can be made.
Is this a good path?
The date letter is N - 1768.
Phil
Thank you!
Can you name the city?
I though it was D or O 
It’s London, but I thought you knew as you copied the maker’s mark image from my web site.
The date letters in question are:
D, 1759:
N, 1768:
O, 1769:
Thank you very very much.
I hope you didnt find it as unpolite to copy that image but I just wanted to be sure that my way of thinking was right. I was not sure that its S.J as on photo.
That marks are hard to be viewed clearly.
So it’s S.J who made it , London around 1759-69.
Many thanks.
Yes, made by SJ, but we don’t know who he was. And the date is definitely 1768. You were not at all impolite - it’s nice to know that my site is being useful!
Phil