Original monoblock of the Music Link series : the MA-7A came later.
The MA-22, shown here bellow, is the slightly later export version with the Music Link tag added by Philips NL but otherwise identical.
The MA-23 is the later version with redesigned switch and "blue star" surround (like on the SC-22 vs. SC-23), less distortion and, mostly, a better s/n ratio.
All three are Class A/B monoblocks with single parallel push-pull output stage, low-leakage toroidal trafo, copper-plated everything secured to a single piece diecast chassis, 8mm front, 3mm vented top, gold-plated terminals and... 50,000¥ less expensive than the MA-7A.
A nudie of an MA-22 here.