Interesting that there seems to be at least two different castings based on the two detailed photos I can find. There is a current ebay listing with a pen that has slight but definite differences in the calligraphy and trademark. This made me nervous. But tonight I also found photos at a reputable site that matches your pen exactly. So I am happy to go through with the purchase. Sorry for the question but the differences between your pen and the other currently listed are very obvious if you look carefully. I have not read of there being two different versions of the already rare smooth heart sutra pen. Nor am I aware of any reports of counterfeit pens.
質問してごめんなさい。でも精査したら貴方のペンと現在出品されているペンには相違があります。希少且つスムーズなハートストラペンに2つのバージョンがあることも偽物のペンについての報告があることも知りませんでした。