I would like to thank you both Nigel and 2209patrick for your responses. I am sure my grandfather would also express his thanks, now we have a little more history to discuss.
Thanks again, your assistance is greatly appreciated. .
My grandfather recently gave me this mug that has been in my family for a few generations. I have done some research, but can't seem to find an identity for the Maker's Mark. I believe it is from London, and I think made in 1761 (but I am really unsure of the Date letter identification F?). Any help...