1 Introduction

The past several years have been very rich in observational studies of galaxy formation and evolution. One of the most interesting conclusions of these studies is the continuous assembly of galaxies (see Ellis 2001 for a recent review). Among the best local examples of delayed galaxy formation are the so-called multi-spin galaxies - objects with more than one axis of rotation (Rubin 1994). Polar-ring galaxies (PRG) are probably the best known instance of multi-spin objects (see Whitmore et al. 1990, hereafter PRC, for definition and catalog of such objects). PRG probably represent products of merger or external accretion phenomena (PRC, Reshetnikov & Sotnikova 1997).

In this article we present the results of photometric observations of ESO 603-G21 - a good PRG candidate according to Whitmore et al. (1990) (see Fig. 3f in Whitmore et al. 1990 and contour maps in our Fig. 2). This galaxy resembles an early-type galaxy with a well-developed bulge and an extended warped and edge-on disk/ring. A dust lane can be seen at the intersection of the bulge and the disk/ring.

The spectroscopic data for this object indicate a complex scenario. The rotation curves for ESO 603-G21 show that the gas and stars in the disk/ring revolve around the minor axis (PRC, Arnaboldi et al. 1994). At PA = 24$^{\rm o}$ (minor axis), the spectra show no motion of the gas perpendicularly to the disk/ring. In contrast, the absorption line rotation curve indicates the existence of stellar motion along this axis (Arnaboldi et al. 1994). There stellar kinematics possibly indicate that the underlying stellar body is triaxial (Arnaboldi et al. 1994; Arnaboldi et al. 1995).