Back in April, 2008, the late yairi_luvr wrote in this Forum:
"There were two versions of the CY130: the 1970s to 1980s version with a carved headstock in the Moorish style and a late 1980s/90s version with a plain coral rosewood headplate. The CY130 with the carved headplate is the more collectible model. I think that all of the CY130s were long scale guitars: 660mm in scale length.
For a long time I thought there were only two versions of the CY130, but, there are actually 3 (4 if you consider the CY132 as one). I own one of each, the one from the mid 80s that has NO carving on the headstock, then one from 1976 that has a Moorish carved headstock, and another from 1970, which has a totally different design carved into the headstock. It does have a different model number 5036~ Yairi Virtuoso (they switched up the model numbers from 4 numbers to 2 letters 2 numbers, sometime around 1974-5), then the 5036 became the CY130. There are other details that are slightly different between the 5036 and CY130 (mine) the rosette is different, as are the tonewoods used on the back and sides. The 5036 is Indian Rosewood, the CY130 is Oceania Coral Rosewood (quite pretty), tops are solid cedar".
Although your Sadao Yairi is a Clase 5030 & the one discussed above is a Clase 5036, the description of the woods used probably relates to both. Their dates are both 1970.
Hope this helps.