Bookbinder's hammer.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...r_fullsize.jpg
Previously:
Glass cutout hammer - GIF
Harbor Freight "Celtic Circle" hammer handle - video
Hammer + ratchet in one - photo
Cell phone hammer - photo
Hammer with collated nail dispenser by michaelyoung4190 - video
Hand engraving a hammer - GIF
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