Hi Rick,
Surprised this has not received more attention, at first thought this might be variation of Russian bardiche, but now believe Polish axe, probably mid to late 17th century. The stamped marking may, as you have noted, be a tamga, an ancient ancestral marking form that became foundation in degree for many heraldric devices, those in Poland in particular.
The Russian bardiche has more elaborately profiled blade, but the contact of the bottom of blade with haft characteristic.
All the best,
Jim
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