I don't know if this is the 1980 or the 1981 catalog.
I used the inflation calculator to convert SEKAI 2700 1977 prices ($285) to
1981 and got $420, so I am guessing this is the 1981 catalog.<p>
<img src="sekai81_cover.jpg"><p>
<img src="sekai81_4000_from_cover.jpg"><p>
<img src="sekai81_2700_400.jpg"><p>
<img src="sekai81_150_and_specs.jpg">