  The central star (CSPN) of the planetary nebula M 1-25 (PN G 4.9+4.9) is
classified as a [WC 6] star, the only CSPN of this subclass known at this time.
A comparison with the other emission-lines CSPN (the [WC]-class and the 'weak
emission-lines stars' or {\em wels}-class) shows that (1) the characteristics
of this [WC 6] star fit well inside the main properties of the other [WC] CSPN
; (2) the [WC] CSPN seem to evolve from the [WC 8-11] (latter) to [WC 2-4]
(earlier) subclasses, say from dense nebulae with cool stars to more extended
nebulae with hot nuclei, as for other CSPN ; (3) on the two-colour IRAS
diagram,the [WC] and the {\em wels} CSPN form two different groups : the
progenitors of the [WC]-type CSPN seem to be Carbon stars evolving along
post-AGB tracks, whereas the {\em wels} CSPN seem to be related to OH/IR stars,
some of them having possibly experienced a late helium-flash.
