
1) Brass 2) Copper alloy 3) Thin sheet metal 4) Tin in thin sheets 
Found on 
https://www.crosswordclues.com/clue/latten

 The term latten referred loosely to the copper alloys such as brass or bronze that appeared in the Middle Ages and through to the late 18th and early 19th centuries. It was used for monumental brasses, in decorative effects on borders, rivets or other details of metalwork (particularly armour), in livery and pilgrim badges or funerary effigies. Me...
Found on 
http://en.wikipedia.org/wiki/Latten

metal in thin plates
Found on 
http://phrontistery.info/l.html

• (n.) Sheet tin; iron plate, covered with tin; also, any metal in thin sheets; as, gold latten. • (n.) A kind of brass hammered into thin sheets, formerly much used for making church utensils, as candlesticks, crosses, etc.; -- called also latten brass.
Found on 
http://thinkexist.com/dictionary/meaning/latten/

(from the article `horse brass`) ...or check its upward movement. The use of these ornaments is of considerable antiquity, but most English horse brass dates from after 1830. Earlier ...
Found on 
http://www.britannica.com/eb/a-z/l/21
 Lat'ten  noun
Lat'ten  noun [ Middle English 
 latoun , 
 laton , Old French 
 laton , French 
 laiton , probably from Old French 
 late lath, French 
 latte ; -- because made in thin plates; confer Italian 
 latta a sheet of tinned iron, tin plate. French 
 latte is of Germ...
Found on 
http://www.encyclo.co.uk/webster/L/18

Latten (also known as laten, lattin and laton) is a yellow alloy of copper, zinc, lead and tin used for making monumental brasses and church candlesticks.
Found on 
http://www.probertencyclopaedia.com/browse/GL.HTM

[
n] - brass (or a yellow alloy resembling brass) that was hammered into thin sheets
Found on 
http://www.webdictionary.co.uk/definition.php?query=latten
 noun
 noun brass (or a yellow alloy resembling brass) that was hammered into thin sheets; formerly used for church utensils
Found on 
https://www.encyclo.co.uk/local/20974

A yellow, copper based alloy similar to brass.
Found on 
https://www.encyclo.co.uk/local/21090
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