This is a back cover for the Zebco 606. If needed, it would fit the 600 also. Part number UZ 23-A. This style has the word Zebco on top of the cover.
Zebco 202 Spincast Reel
Found a 1982 Zebco 33 combo half-buried in the mud. Brought it
Zebco 600 Spin Cast Fishing Reel.
Unsure about reel : r/FishingForBeginners
Unsure about reel : r/FishingForBeginners
Zebco Back Cover that fits the 600 spincast reel. NEW/NOS
Zebco 33 Spincast Fishing Reel, Quickset Anti-Reverse
Zebco Spincasting Fishing Reel Parts & Repair for sale
Zebco Metallic Spincast Reels Pre-Spooled With Cajun Line 10lb