Is this jug a davenport?

Could anyone tell me who made this piece of pottery?

it has incised or an impressed marking and numbers which is on the base- the letter is D and the three numbers are 775-

the jug has like moulded grape theme, mixed with flames and lines that form a pattern.

Originally the jug would of been gold crowns and swirly flower patterns and little fairy faces which are starting to fade, there is four hand drawn crown around the picture left,right,top,bottom. (Bottom crown is upside down)

inside the jug there seems to be little brown dots and       Lumpy dots form a line. If I get a mirror there looks to be in fine brown pen, a J but squiggly/

there in the picture I thought was the Virgin Mary playing with a child, the child has wings.

does anyone know this picture of who these people might be. 

Is the jug a davenport or a derby, or can anyone help me identify this,

I found the D marking in a book /made in Great Britain ceramics and pottery stamps - it says it is a later davenport but derby have the same D marking but I'm unable find proof any ware to say its a derby or royal derby, 

four years I have searched high and low to find out who the jug is made by, and who the pretty lady and angel boy is- 

i am also unable to find the pattern number 775 anywhere as davenport only went to 700 stamped with the same D- could this be a later davenport piece like what the book says. Also on the same page it has Herculaneum until 1845 impressed or printed a D.

please see photos and stamps any help I would be very grateful.

thank you.