This is when the wearing of the hammer began. We have evidence of Thor/Thunor Hammer amulets dating back prior to the viking age. An example of one is the 6th century hammer from Gilton, Kent. This hammer was manufactured within 100 years of the Englisc invasions when what was to become England was still a heathen country. Therefore whilst there may be a valid argument in the popularity of the hammer as a sign of resistance against the creeping Christianity of the Germanic peoples, it existed before the conversion period. Indeed we have evidence of Bronze Age northern Europeans being buried with axe amulets. Hail to the hammer!