How to determine Boker USA Tree Brand age?

VTG 1970s BOKER USA TREE BRAND 8593 3 BLADE STOCKMAN FOLDING

BOKER Folding Lockback Hunter - 20-21 Rosewood

Boker Copperhead 3.75 Inch Pocket Knife, Smooth White

Boker Tree Brand - Great American Story Knives: Alamagordo

FAQ, Manufactory

Boker Knives 110746 Copperhead Jigged Pocket Knife

ca 1903 PAPER AD 12 PG German Boker Tree Brand Pocket Knife Knives Office Corn

Vintage Boker Tree Brand American Story Alamogordo Dawn of the

Boker Pruning Knife

Boker Tree brand Classic 1000 German Lock Knife

Boker USA Tree Brand 1428 Delrin Pen Knife

Boker Plumwood 20-20 Pocket Knife 5.25 Closed, C75 Carbon Steel

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Tree Brand Boker 6 blade Congress w/ waterfall or “step bolsters, Nice handle

Dating a Barlow by the Bolster Tree?