Very sweet find. 1935 New Guinea, One Shilling, .925 silver, mintage-2,100,000 I am not sure what grade your coins is ? VF20-$2.75 XF40-$4.50 weight-5.38 g. or 0.160 oz. KM#5 catalog number
I'd take that any day over a another 64-D quarter. Plus if I had to guess there is a good chance it was brought back by some GI during or after the war.