E84100 would be the 100th Paramount frameset scheduled for production during the month of May, 1984, at the Waterford facility. This was around the time Waterford began using the "self-describing" serial numbers.
Paramount production began in Waterford in 1981 using the same serial numbering scheme Schwinn had used for Paramounts made in the Chicago factory "cage" during the seventies.
Here's the 1981 Paramount road bike catalog page after the move to Waterford. Note the copyright date in the upper left corner.
This is a 1983 photo of the Waterford facility taken during an "open house" event; Marc Muller is second from left.
