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これいいなと思ったがLAMY2000は定価10000円、売価7000円という感じでマジか
LAMY 2000 4色ボールペンにJetStreamの替え芯を入れてみた | OZPAの表4 https://ozpa-h4.com/2014/03/10/lamy-2000-jetstream/