These are not dummy fuzes , no.
Pretty sure they aren’t replicas either.
They are for 20mm Incendiary (usually with Tracer) rounds. Basically the Sprengkapsel sits in the top of the fuze & once it breaks on impact it ignites the rest that is inside of the projectile. Added a drawing of this fuze & also an example of what it is used on. As you can see , one of the fuzes still has some blue paint on it. Which makes sense because these rounds are blue too. Mostly with a red band just above the driving band to indicate that there is a tracer.
Theres several other fuze variants of this one. One more common than the other.
I hope this answers your question.
Bever
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