The Fender Musicmaster Bass amp (see page 24 of this catalog) was a companion instrument to the Fender Musicmaster bass guitar; low-priced gear for students and home practice. Theye were sold individually, and as a set (see page 25)
This is the second occasion the Musicmaster bass has been listed in a Fender full-line catalog; there are a few subtle stenciling changes on the control panel, but essentially unchanged - compare with the previous catalog image here.
In February 1972, the Musicmaster bass had a list price of just $139.50
$650
$203
$590
$595
$750
£680