I have had this for a while now, I am pretty sure it is from a Super Connie, but there is always the chance it is from something else. It measures 23 inches across at its widest point, and approximately 25 inches tall.
P-61 had Curtiss Electric propellers, the spinner is Hamilton Standard. The P-61 spinner is kinda thicker/wider.
IMHO this is a postwar spinner - the stickers and the font look modern to me.