I was thinking a trunk makers tool, the blade for cutting the leather, possibly detail work around the edges of the trunk and the "hammer head" for setting the tacks, not driving them which a tacking hammer would be used for. I have seen an old video of a tacker at Louis Vuitton and they just set and drive with a tiny head tacking hammer. Other than for presetting of tacks I can't see that head being used for driving any kind of tack. The claw however does have a tack grip in the V of the claw so was used for that purpose. The strange piece is the head which would be used to lever the tack out but is a very weird shape for that purpose. It really has to have something to do with the angle at which you pull the tack.