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It's not so rare I think. There were 15 million of them after all so they are easy enough to find and I see them at dealers all the time. But the price of it is ever going up due to the high silver content. I paid ¥3000 for this and I think it will just keep going up.

I see, I haven't been to dealers I guess (I'm not so exposed in that area). 3k yen is kinda reasonable "for now". It's a collector's item.