RobT
Acemeccanoman
According to Graces GuideI think Trix made between 1961-65 at Summer Lane, but you have brought out some other interesting information.
See photo below shows my mother Pauline (died 1988) working at the Coronet Camera Factory, Summer Lane on 1st December 1957.
Coronet closed in 1967 I believe.
By 1958 Dufay-Chromex was known as Dufay Ltd
1958 Ewart Holdings, owners of Trix, collapsed. Dufay Ltd was a major creditor who acquired the assets of Trix and Precision Models.
1960 Dufay moved Trix production to Birmingham.
1961 Mr Marcel Martin, who controlled the Highgate Optical Manufacturing Co, and his associates acquired about half of the preference shares of Dufay[1]
1961 Dufay Ltd, photographic film and equipment makers, would need a drastic reorganisation of capital after heavy losses and write-down of stock; 2 acquisitions were under consideration; no dividend had been paid since 1946 on the ordinary shares[2]
1961 A subsidiary, Spicer-Dufay (British), had been renamed Trix Products; the managing director of Trix of Germany was appointed to its board[3]
c.1961 Poor sales lead to Dufay ending Trix production in order to save damaging the rest of the group; Trix was prepared for sale.
1962 Dufay would become an industrial holding company; Trix and Dufay would be disposed of; the Coronet camera subsidiary had recovered from the previous year's set-back; Polyfoto (England) was being reorganised[4]
1962 Trix was sold to Alvus Investments and Trading who planned to restart production in High Wycombe, but only the coach moulding tools were made.