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だったけれど

although it was

→ だ
phrase Rare #40,762
although it was Connects a past-tense statement to a contrasting idea. It can also be translated as “but it was.”
JA: 雨だったけれど、散歩に出かけた。
EN: Although it was raining, I went for a walk.

そんなのは完全な見当違いだったけれど、実際にやろうとした人がいたのだ。

That was completely misguided, but someone actually tried to do it.

前払いが条件だったけれど。

They required payment upfront, though.