Weird die clash

There's stuff going on with this coin I'm at a loss to explain. 

On the obverse, legend is overstruck to the right of the bust. “Hisp” is discernable at 5 o'clock but in the wrong place. I don't think this is a clash, but a mis-alignment of dies.

If this is true, there were at least three hub dies, or the left legend would also be off.

But the reverse is where it gets wacky. 

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This is a die clash, but not from the obverse die which would be normal. It seems to be from a different crown reverse. How can a reverse die clash into another reverse die?

My knowledge of minting technology is basic at best. Is this a challenge? It wasn't meant to be, but if it helps keep us ‘senior’ folks from falling into senility, then yes.

I'm totally appreciative of any advice, corrections, or input of any kind.

 An older coin of same size underneath, which has been re-used 

rather than melted, and has been over-struck with that new design. 

 Here is [different coin] an example I own > 

https://en.numista.com/forum/topic74491.html#p603675 

 Apart from that large over-stamped crown on the reverse, 

there remains the first part of ARCHID next to it as well. 

 Slightly cropped and rotated pictures 

 Presumably the original coin was a few years earlier and from a similar location. 

The reverse may have had a shield below the crown. 

My thanks. That's something that would never have occurred to me and it makes perfect sense, explaining abnormalities on both sides. New regime, in this case Charles VI overstamping previous coins. Any idea of the parent coin?

 One possibility - similar age and size 

[1680-1700] N#19971 [25mm] 

 The horizontal added yellow line may be the top part of the shield. 

Shame not much of the original obverse remaining, to confirm more. 

 On the reverse, just before the ARCH is something curved, so may 

have been a 2 number - from that 1692 date luckily. 

 Although - it is NOT that coin - as the crown is too large. Shame :(