Fascinating stuff ! Chailly and Varese, ahah. This is an old recording 1954 under Varese's supervision.
Robert Crafts version is fantastic and way more better sounding.
'Forellenquintet' (Ingrid Haebler, Arthur Grumiaux, George Janzer, Eva czako, Jaques Cazauran)
+ Sonatine in D, Op.137 No.1 D384 (Henryk Szeryng, Ingrid haebler)