Topic: A cup (or a can) with a Diamond mark

[Potterycat]

This cup (or can) give me head ache, but may be it was used to cure it?

What was it used for? With what? Boullion, soup or tea? For a sick person in bed?
I have not seen similar before, but maybe it was usual before in good old England?
If I have read the Diamond mark right, it says registration was 1875 april 3.
The mark is on a tape, but one number is on the glaze - which give me more head ache...
The last question mark to be a exclamation point; Who made it?

Yes, that?s all, and I hope some one will curate the questions and the head ache. 

[keith]

Might be a posset cup,a hot drink made with milk and curdled with ale or wine  ,supposed to 'make you better',

[Anne]

Yes it's a feeding cup, used to provide liquid (milk, soup, posset) to infants, invalids, the elderly or infirm. Anyone who needed help with being fed. The date of registration is as you suggested, 3 April 1875, and I've searched the online registers at the National Archives and the search has returned 3 registrations for that date (I'm unsure if the whole collection is online though.)

The three are as follows:

Registered design number: 290262.
Proprietor: Edward F Bodley and Son. Address: Burslem, Staffordshire.
Subject: Tea ware basket embossed.

Registered design number: 290261.
Proprietor: Edward F Bodley and Son. Address: Burslem, Staffordshire.
Subject: Tea ware "Stork" handle.

Registered design number: 290259.
Proprietor: John Dimmock and Company. Address: Albion Works, Hanley, Staffordshire.
Subject: [Not given in BT 44/8].

The description of the first one (basket embossed) could be the one you have, but I'm not sure.  It's a place to start looking though.