Although the Arodo 120b and 130 machines had been in the top league 30 years ago and they still can keep up with some machines today,but selling a machine like this is very limited in my opinion,they are reasonably heavy,bulky and also require alot of constant fine tuning as the meter requires adjusting alot due to the design of these detectors.Terrific machines especially the 120b which i do own on clear pasture or roman sites,if that needles bangs to the green side its a good target.
The market for these old classic machines is limited in my opinion,the plastic often faded from white to a horrible yellow colour and if it does have the yellow on it then this can detract the price lower,if someone wants a machine to kindle detecting days from years ago and take a trip down memory lane then this machine will certainly do it,but for newbies then alas this is not the best machine for a beginner.
Price wise would be about £175 for a minter and lower for a plastic yellowing example,good luck on what was once the Rolls Royce model here in the UK.