1971-P Kennedy Half 40 Percent Silver & Planchet Striations

I checked weight on 13 1971 Kennedys that I have. 9 are 11.2 gms, 3 are 11.3 and one is 11.1 gms!

OK. I'm going with the plated theory. Were the striations caused by the plating?
Also, I did, or think I did a correct specific gravity test. I took the dry weight and divided it by the weight suspended in water. 11.3 divided by 1.3 = 8.56 grams. Too light for a 40 percent silver coin.
Since I paid 50 cents for the coin, I'm out nothing.

Thanks for all the comments.

Interesting Post,

I see a 1971 Kennedy half dollar. I also see The coin shown has Very Inconsistent, Spotty Appearing "Copper Plating "... The Planchet I have seen These Kennedy's with The Striations as Seen Here.

I Could see a First Year Transitional Experimental Process, For the FIRST year this 1971 KENNEDY was Minted, with the Newer Cupro-Nickel Finish..


I Believe the Coin Here is a Plating Problem, By Whom, ?

Other 1971 Kennedy's Exhibit No Inconsistent Copper in the Coin, As The OP's Coin.... I Too checked a Couple rolls I have around, .............. NONE like This......

All Kennedy halves were Minted to Start in 1964, Then they were 90% Silver, No Copper Rim along the Reeds Seen.

From 1965 To and Including 1970, Kennedy halves were 40% Silver...No Copper Rim along the Reeds Seen.

After 1970 They were struck for circulation in Cupro-Nickel , Some San Francisco Strikes were 40% Silver Too, In 1975 Some Kennedy strikes were 40% Silver Too, Brown Boxes, Blue Boxes.... including and up to, 1976......