Curiously, both Concorde and the Tu144 built the same quantities of aircraft, 4 prototypes and 16 production aircraft, for a total of 20 each. Two of the Tupolevs were static test airframes and didn't fly, and it is doubtful whether the final production Tupolev flew either, but in manufacturing terms both were equal.
Also curious that the two well-known accident sites, of one of each type, happened almost within walking distance of one another, although Tupolev lost a second aircraft during flight testing.