Pair of Nebraska 1998 license plates - 77 Mark V - Lincoln- 1977 ???

Description

This is a unique pair of license plates.  I wonder if they were on an antique 1977 Mark V Cadillac.  The sticker date is 1998. Very, Very Good condition.  One plate like new.  The second plate almost like new but has a bit of surface rust on backside bottom.  Please look at photos.
Would be a great pair for someone's collection.  Thanks.  keywords: car, automobile.  I was told not a cadillac but Lincoln Conteninal