, Nathan Milstein , Felix Mendelssohn-Bartholdy , Max Bruch , Philharmonia Orchestra Leon Barzin - Concerto In E Minor / Concerto No. 1 In G Minor

Release from UK, issued 1961, label differs slightly from other UK 1961 release. The engraved 'WT' on side 2, it is an old taxation symbol from 1960. This 'WT' stamp debuted 8/60 and I see from Billboard Magazine that US Capitol released the original version 2/61. US Capitol had UK EMI manufacture their contract pressings concurrently, before or some time after US Capitol issued their own US version and announced it to Billboard and Schwann.
From London Jazz Collector:
UK Purchase Tax Codes
Date introduced:
Dec 30th 1950 AT
Apr 15th 1953 NT
Oct 27th 1955 RT
June 1st 1957 XT
Oct 1st 1958 UT
Apr 8th 1959 ET
Aug 1st 1960 WT
July 26th 1961 OT
Apr 10th 1962 ZT
Nov 26th 1962 PT
Jan 1st 1963 MT
July 1st 1963 KT
Nov 23rd 1968 JT
Apr 1st 1973 –
Purchase tax replaced by VAT

The WT stamp indicates that this version is a first UK issue.