You could digitize the contours from the toposheet with attributes (Elevation). Then Interpolate the contours to create an Elevation Raster (using the Elevation Field of the Contours).
You could then use Raster Calculator to extract the Raster Values < 200 m.
Convert the Raster to Polygon, and intersect the Polygon with the Vineyard boundary polygon.
The resulting polygon is the area of the vineyard below 200 m.
Think Location