You are considering a vintage British No4 Mk III Spike Bayonet. It's the 4th iteration of the bayonet and the socket was made of stamped steel pieces.
WWII British Lee Enfield No.4 Mk. III spike bayonet with Bakelite scabbard - Militaria
Lee enfield bayonet hi-res stock photography and images - Alamy
A post war British/Canadian No4 MKII Lee Enfield spike bayonet. Marked CA for Canadian Arsenal Ltd. Plastic MKIII scabbard. In very good condition. Price 75 euro - Bolk-Antiques - Recent Added Items
No 4 Mk 2 Spike Bayonet in Tropical Frog in Bayonets
Original Rare WWII British 1st Pattern Cruciform No.4 MKI Spike Bayone – International Military Antiques
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A post war British/Canadian No4 MKII Lee Enfield spike bayonet. Marked CA for Canadian Arsenal Ltd. Plastic MKIII scabbard. In very good condition. Price 75 euro - Bolk-Antiques - Recent Added Items
Canada: English (Canadian)No.4 MK II bayonet by Long Branch, Canadian marked scabbard. (ABC N 33-2 )(K 3)(JN 60-3 )
Armoury Antiques and Militaria: Ref: 4830 - Rare No.4 British Lee Enfield MK1 Cruciform Bladed Bayonet, Scabbard and Frog.
The French No. 4 Enfield Rifle - Guns and Ammo
Lee Enfield No. 4 Mk II* bayonet British PSK manufacture
Enfield No4 Mk3 Spike Bayonet Welded Late War
Original British WWII SMLE No.4 MKII Spike Bayonet – International Military Antiques
No. 4 bayonet - Wikipedia