The Claymores just a Scottish Longsword or Broadswoard,the earlier types have the cross guard facing up to the sword tip like in one of the pictures earlier.The later designs have a basket hilt,The earliest positive date for a basket hilt is 1545, from a sword found under the wreck of the Mary Rose.
I've never heard of the Vikings (Viking is an activity not a tribe or people,to go viking meant to go raiding)using Claymore swords at the time of there occupation of Britain,the Claymore is a much later weapon.
Viking swords
Highland Claymore,blade length 56 inches,15th century.
hey Germanicus,Durham isnt in Scotland you know.