What we have here is a copper tab held in with a galvanized nail.
More importantly, we're missing a slate. Snow sliding down a slate roof in a glacial manner will often pull slate held in with copper tabs right out. Slowly moving snow will also act on snow guards, which will in turn, bend or break slate. This slow moving snow can cause a great deal of damage, even more so than snow avalanching off of the roof. Even though the sudden effects of an avalanche are more dramatic than a glacier, the later can carve out much more damage.
Snow, especially snow on poorly insulated and ventilated roofs, can freeze and thaw throughout the day and night, and wreck havoc on slate roofs. Shown below are the typical effects of snow moving glacially down the roof. Not shown is the damaged gutter. Avalanching snow will rip the gutter down, and easily take out a glass table, lawn furniture or a boxwood.
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