The problem is that the spear was such a common item from furthest antiquity
until the 19th century that there are no hard and fast rules unless you already know the general culture and date range.
Do you have more info - full length photo, dimensions, etc.?
It's just over 16" x almost 2" (410 x 50 mm), and weighs 1.6 pounds (742 grams). It's on a sale listing and I don't think I'm allowed to say where or by whom, but I can add five of the pictures from the listing: