Is it safe to detonate a rusted hand grenade?

I've a hand grenade but the outer shell is completely rusted. The chrome looking rod on top, the handle and the pin are not rusted.

Will it detonate ?

How look does it take to explode after the pin is removed ?
Update: Typo: Look = Long
Update 2: Laughter: The paint covering the grenade should be dark olive but its all worn off. The type of grenade is the one with 32 bumps or stubs similar to two turtle shells stuck together.
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