Note
The CC-1 was never advertised in QST, so the date of introduction is assumed to be between the time the individual converters were first advertised (Dec 1966) and QST's review in Feb 1968. So, almost certainly 1967. Mentioned in this ad: QST, Apr 1973, p. 116.
The CC-1 will accommodate two converters (SC-2 and SC-6) with room for a third (though Drake did not make a third converter), the CSP-1 power supply, and SCC-1 VHF crystal calibrator.
References
Review: QST, Feb 1968, p. 51.