  We report the detection of broad, high-velocity oxygen emission lines from
the site of SN 1941C nearly eight decades after outburst, making it the oldest
optically detected core-collapse supernova/youngest core-collapse supernova
remnant with a well determined age. In contrast to the strongly blueshifted
emission line profiles observed for all other late-time CCSNe thought to be due
to dust extinction of rear hemisphere ejecta, SN 1941C's spectrum exhibits
stronger redshifted than blueshifted emissions of [O I] 6300, 6364 A, [O II]
7319, 7330 A, and [O III] 4959, 5007 A. The oxygen emissions exhibit rest frame
expansion velocities of -2200 to +4400 km/s. No other significant broad line
emissions were detected including Halpha emission. We discuss possible causes
for this unusual spectrum and compare SN 1941C's optical and X-ray luminosities
to other evolved CCSNe.
