This is a more accurate and virtually identical meter to the earlier model 71. The 1Amp fuse has been omitted but otherwise much the same.
Unfortunately the meter movement was found to be open circuit
The Taylor model 128 is almost
identical except it does not have the 2.5Amp range
You will find more information
here about these instruments and other similar models. AVO produced a range of
the smaller multimeters such as this which are described
AVO produced the "70 series" range of analogue pocket meters with 2000 Ohms/Volt sensitivity and 3 inch scale lengths at the beginning of the 1970's. The following is from a 1972/3 trade catalogue.
For further information have a look at my pages on similar AVOmeters here