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1944 Henning Nickels

Henning is stated as having used a Monel alloy of 79.1% copper, 20.5% nickel, 0.4% iron. I recently had an early die state 1944 Henning (normal bar base on left leg of R, weight 5.0 grams) tested with a Thermo Specrtrometer and it was very close to this stated Monel alloy consisting of 79.1 copper, 20.8% nickel, 0.1% iron. Does anyone know of more about early die state Hennings?

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