Is Seiko discontinuing the MM300?

[toxicavenger]

Does Jack at IWW still service MM300's? He used to.....

I am not sure. You can ping him and ask.

exchanged emails with Jack. He no longer services the MM300. He said it's too difficult for him to get parts.

That is what I thought he told me a few years ago. So the next option I would recommend is contact in Seiko in New Jersey. The last few years I have had great luck with them.