Yes it is a Yamaki (89 )
And that is a very nice guit you bought yourself Tio, I had a friend who had one very similar to yours and unfortunately he broke the neck off ( not sure how he did that ).
I also recently purchased a D70-SW but thank goodness I did so through pay-pal the guitar was not like the pictures he had sent me and I was able to return it through a pay-pal dispute, he had modified the bridge and changed out the original tuners for some real cheap sets ( which were even mismatched ) and for that amount of money ,well back it went.
And on goes the hunt for one in just as good as shape as my D-68SW, but I also notice that they are going up in value on the market. Two years ago they were selling for around $800-900 todays market seems to be closer to $1200, go figure.lou