The last year of the Calais was 1976. As Maxwedge said, it was a entry level Cadillac. They were based on the Devilles and had very few of the options that Devilles had standard.
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Portland, Maine
2000 STS 4.6 Northstar
1994 Sedan Deville 4.9
1993 Coupe DeVille 4.9
2008 Triumph Sprint ST 1050 ABS