Congratulations on purchasing a Discovery II for such a pittance.
The Discovery II was revised several times during its short run as evidenced by these three different model ids: 1500, 1500C, 1572E (to find out which yours is check the name stamp on top of the hood--release the handle assembly to view).
It was Electrolux Corporation's first L-shaped upright and was manufactured from 1986-87 in the same sand/jade colors as the: Model ?/Discovery Plus (1986-87), Model 1521/Diamond Jubilee (1984-87), Model 1453/Deluxe Special (1984-87), Model 2100/Hi-Tech (1985-87), Model 1623/L-E (1985-87), Model CB2000 (1984-87), Models B-9 & 1522/Floor Beautifier (1984-87), and the Turbo Rug Washer (1984-87).
Does yours happen to have the small brush running along the back side of the brush roll opening as the jade-colored PN-6 power nozzle?