*Type IV - filigree.
**20 finds, 17 from Sweden, 1 from Norway, 1 from Finland, 1 from Russia.
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===Birka Type V Silver sheet - filigree===
Filigree brooches are made thus: the front plate was cut to shape and relief decoration imprinted by a bronze die. Sometimes a plain back-plate was affixed. Finally filigree and granules were soldered to the front plate raised features. (ROESDAHL 1982, p.105)<br>
‘Patrices’ were used to achieve the basic convex shape. Made of bronze with raised relief. The silver sheet was placed on a yielding base and the Patrice hammered into it. (ROESDAHL and WILSON 1992, p.254 cat.105,106)<br>
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===Birka Type VI Silver sheet – punched and stamped===
|Archaeology =
*11 finds, 3 from Gotland, 7 from Sweden, 1 from Russia. Type VI are similar and may have been based on English prototypes with their 5 raised rivets.
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==Large convex round brooches [V/F]==