I am puzzled with this date letter which I believe would be from 17th/18th century and probably from London. As seen the tankard itself is clearly old so the tankard could easily be estimated to be from the time or is it a historism type of product. Any other markings I have not been able to trace which could have been worn out.
![Image](https://i93.photobucket.com/albums/l54/kerppola/Mark1_zpsfzizgnzb.jpg)
![Image](https://i93.photobucket.com/albums/l54/kerppola/Mark2_zpswtytr1u4.jpg)
Regards,
Juke