Quote:Thanks for the detailed replies.
This may sound silly (I may have just had an epiphany,) but, based on my calculations, the weight of silver in a Rosie dime is proportional to that in a
Washington quarter or
Kennedy half.
So, there is exactly 5.625g of silver in a pre-64
Washington quarter. I would expect there to be a ratio of 2/5 of silver in a Rosie dime, which there appears to be at 2.25g.
This now makes sense to me :)
A simple(ish) formula to determine melt value on the fly is (correct me if I'm wrong):
spot * .03215 * 22.5g = multiplier on face.
Thank you all!
Your formula does not account for wear on "average circulated" coins as 90% is assumed to be. The 0.715 multiplier accounts for a little over 1% weight loss from wear.
Just take the spot price X 0.715 to get your FV multiplier. Heavily worn coins (below G04 condition) should be avoided as they will weigh even less.