ND 1967-1975 Phillipine 50 sentimos (wrong planchet error) struck on a 20 centavos planchet NGC

Freshly acquired specimen in which IDK much about . I need help!
1) what is the value of such an item?
2) Was this coin struck @ US mint?
3) Is this a mega rare occurrence for a phillipine coin?
4) is it desirable to own?
Many thanks in advance

 

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From the NGC page - this is the actual coin

 

According to this link:http://minterrornews.com/news-5-13-03-foreigners_in_the_mint.html
There were Phillipine coins circa 1960-70s accidentally struck on U.S. planchets and U.S. coins struck on planchets intended for phillipine coinage, so I believe I answered question #2. Which makes this example even more exciting than it already was because it most likely happened at the US mint

 

Very nice. Thanks for sharing!

oh and #4.. I desire it!

 

One thing I've not done yet in my research is check the date on the host planchet to see if I can narrow down possibly when this could of actually happened at the mint. I have a krause book and when I get home tonight I'm gonna see if / when they stopped producing 20 centavos coins. Wouldn't it be cool if that coin had it's weight reduced etc etc to help narrow down some of the who what when's and why's I still have on this coin. Been a fun journey so far.

@lordmarcovan is this odd/eclectic enough 4 ya?

 

OK the plot thickens a bit, NGC is calling this struck on a 20 centavos planchet which is 20 mm, 4 grams and it's .750 silver. The problem is, that coin(while struck at a US mint) was discontinued in 1945. Which seems hard to believe unless in fact the planchet IS silver. I can't tell inside of a plastic tomb if its silver or not.Here is the kicker, what's strange is, the 25 sentimos, weighs in at 4.00 grams, 21 mm, is copper nickel and was struck along side the 50 sentimos the same year(s) '67-'74 . All of these coins WERE produced at the US mint. I just love that last part, so, did NGC make an error? Is the coin in question silver,or copper nickel. I think I know the answer already but to be continued.......

 

So what an a enigma an error stuck inside an error
So that said do they cancel each other out?
Will Heavy be downing many Miller's as the plot thickens?
For the answers to these and many other stranger than life questions stay tuned!

 

Ahaaaaaaahaaaaaaahaaaaaa
You must know me pretty good @Paddy54 cause that EXACTLY what I was thinking an error inside of an error!! That oughtta double the value to an air colektor, or like you said cancel each other out. A negative plus a negative equals a positive, stay tuned whilst I down a few Millers, get drunk and figure out more of these burning questions, while Rome burns and I crack the codes.

 

And you want to be my "Godfather . ...... rings bell .....oh heavy.... I think I need a glass of water, ring ring....heavy peel me a grape..... ring ring ring heavy my dipper feels wet...ring ring ring ring......heavy heavy.......oh darn just when I was going to reward you with a roll of circulated 1944 P wheat cents.

 

You have already rewarded me , with knowledge, friendship, advice and just gracing me with your presence. Oh and the time I touched the hem of your robe.

(Wipes brown from nose, hoping one day it pays off)

 

Snatch the doubled die from my hand....grasshopper!