Trying to determine market value of a D Sachs phono stage, please help!

I thought Don was semi-retired.  But he was not in the business of simply selling gear.  What makes you think he would be interested in buying one of his products back?

No question he is approachable and fair.  With that he might suggest a reasonable selling price.

The method proposed to get a rough idea of the Value is viable and one worthwhile considering. 

Alternative, reduce purchase value by 50% of paid price, if the model is upto 3 years old.

Above 3 years old creep price down towards a 60% reduction to counter offers of a 70%—80% reduction. 

My last Phon’ sold, a commercial SS model, that proved to be very very poor, went quickly when reduced to more than 50% off the retail price. I paid near £1500 to have that lesson. 

Have had a similar experience with a early model Hana Cart', a big outlay to be immediately uninspired. 

Anything worth it’s salt is never sold on when I own it. 

Whatever the original retail-50%, start by adding  15%. Begin subtracting that amount if no interest lingers.

Here ya go! Check out the sold listings!!

https://www.hifishark.com/search?q=Don+Sachs+phono+stage

Thank you, everyone!  This puts me in the ballpark, which was all I needed.