The last 40% halves for circulation came out in 1969. 40 percenters NIFC came out in 1970 and 1976. A couple of 1971-D halves were accidentally struck on 40% silver planchets; one sold for $13,000.
Interesting. I'm going to still guess plated, given the higher weight. A jeweler w/ an XRF machine could analyze, possibly for a fee. The original photo didn't have a silvery look to it, but it's hard to tell from a photo. Keep us posted.
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