What is the broadcast date of the episode on 16mm t/r that ran 23:25?
CREATE TABLE "table1_2101431_1" (
  "episode" text,
  "broadcast_date" text,
  "run_time" text,
  "viewers_in_millions" text,
  "archive" text
);
SELECT "broadcast_date" FROM "table1_2101431_1" WHERE "archive"='16mm t/r' AND "run_time"='23:25';