Mexican Model 1913. Long story. There is plenty on the internet and in "The Type 38 Arisaka" book (out of print).
A few years ago, we visited the Bird Cage. On display with the rest of the 'old west' rifles was a T99 naval special. Yep, the lady said, it's a part of old west history. Rather than bag her, I asked if the owner possibly brought the rifle back from WW2 and whether he'd sell it. She replied that he wouldn't sell any of the stuff. Wonder if it was Wyatt's saddle gun. Just sayin.The Bird Cage Museum in Tombstone, Arizona has a Type 38 rifle in it that supposedly came from either a soldier or revolutionary that had come across the border, which is just a few miles away.