what would you think a once common air pistol will sell today when in good condition?

this Haenel Mod. 28 R sold on christmas eve for 3377 euro, this are 5287 Aussie $$$ or 3823 US $$
https://www.egun.de/market/item.php?id=14601172
A SCARCE .177 CYLINDER-COCKING SPRING-PISTON REPEATING AIR-PISTOL, MODEL '28R', made by Haenel, serial no. 1958, designed by Hugo Schmeisser in 1927, with fixed rifled barrel, blade fore-sight, elevating buckhorn rear-sight, hinged air-chamber lifting to cock, the top of chamber stamped 'HAENEL MOD. 28R, BRIT. PAT. NO. 277265 DRP', loading aperture to rear, push-button cylinder release forwards of the trigger-guard bow and smooth wood grips with 'Haenel' medallions inlet to heel. Very nice condition, 98% original blueing, works perfectly, strong power! With elderly original paper-box!

still speechless about the price