Strong spectral variability in NGC 7603 over 20 years ?

We present results of a long-term optical variability campaign on the Seyfert 1 galaxy NGC 7603 over a period of nearly 20 years. The optical continuum and the Balmer and Helium lines varied by a factor of 5 to 10 in this broad-line Seyfert 1 galaxy. Furthermore, it is remarkable that the optical FeII line blends varied with the same amplitude as the Hα and HeI lines. During the first half of the campaign (until 1990) there was a strong correlation between Balmer decrement variations, Hβ intensity variations and emission line asymmetry. This behaviour changed afterwards when the Hβ line intensity was higher than on average.