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The W73 was an American nuclear warhead for the AGM-53 Condor air to surface missile.
The W73 was cancelled in 1970 in favor of a purely conventional warhead for the Condor. None were produced.
The Condor was approved for production in 1975 but then cancelled in early 1976.
Specifications for the W73 are poorly publicly documented. The Condor missile was 17 inches in diameter and had a 268 kilogram conventional warhead alternative to the W73 nuclear warhead.
The W73 was reportedly a design derivative or variant of the B61 nuclear bomb.