We searched for“Heyer Portable Copygraph Duplicator”(identified as Heyer Inc., confidence: High)
Typical realised range (Gemini estimate): £30-£150
Comparables
72
Median
£340
Suggested estimate
£100 – £1,000
25–75% range
£100 – £2,132
Overall range
£10 – £4,503,200
Distribution
Sell-through 99% of lots sold
6% at premier salerooms
Trend↘ falling -72% over 6y
Median from 69 sold (all-time — too few recent sales)·hammer prices, excl. buyer's premium — fair-market auction value (retail/insurance replacement runs higher)
144 comparables for “Portable Copygraph” · page 1 of 6
![[ Books ]](/img/aHR0cHM6Ly9iYXJuZWJ5czIuaW1naXgubmV0LzIzMDgvMjAxMi8xMS8xTEZaMFJIU1VLLzFMRlowUkhTVUtfNUI5OEYxQTc1NQ.tK8bWY622LYa4SXSoeiJ0Q)
![Racing Calendars.- Heber (Reginald) and B. Walker. - An Historical List of Horse-Matches [&c.]...in Great Britain and Ireland,](/img/aHR0cHM6Ly9iYXJuZWJ5czIuaW1naXgubmV0LzUxLzIwMTIvMTEvMzU5OTMvMzU5OTMtMjgw.mAb6EXreJ7Kpq4YMSogyxA)