Huh... I went off-road on this one, finding that the Maltese falcon was made in 1941....and Plutonium was discovered by Seaborg(?) in 1941, so I went looking through his wiki...

Damnation, I even remember seeing mention of Fat Man in the wiki XS

Though I couldn't figure it out, I have to say, this is the kind of mind-bending enigma I was expecting from you, bravo @mr-riddle !

I'm definitely going to be a permanent feature in as many riddle challenge editions as I can !

For some reason I couldn't figure it out at all XS