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Mike, is a great guy and excellent taxidermist. Sometimes hard to get ahold of only because of being busy. Any taxidermist worth their salt is going to be a long wait. Last time I talked with him, he was about 2 years like most. I feel certain you won't be disappointed in the finished product, but I wouldn't be looking for it now if he's only had it a year.
Mike is one of the best in the country by far, I would not worry about it, but continue to try and reach out every couple months if you're concerned.