This is Craftsman 6-3/4" Pliers, Slip Joint, made in USA - Part # 45378. Made in USA.
Craftsman 8" Pliers, Slip Joint, made in USA WF AC - Part # 45379
Craftsman 10" Pliers, Slip Joint, made in USA, WF AF - Part # 45380
Craftsman 6-3/4" Pliers, Slip Joint, made in USA - Part # 45378
Craftsman 6-3/4" Pliers, Slip Joint, made in USA, WF Q - Part # 45378
Sears Craftsman Tools USA Slip Joint Pliers 45750 NOS
Vintage Craftsman 45381 Arc Slip Joint Pliers Tongue & Groove 9-45381 WF USA