The sleeve mentions the ‘Studio group’. It is a generic term referring to the different orchestras that Pierre Arvay conducted for recording his compositions.
Two different sleeves issued over the years, the first being the white-blue-red one with the ‘trumpet’ logo. This is followed by the plain red one.
Other possible variations over the course of the pressings: different round record labels (red or white-blue-red), various sleeve printing types (for example ‘glossy’ appearance or not), different sleeve printing companies, different contact details for the Music De Wolfe office in London, pressing of the records in England or Holland.