I saw a few of the Takayama SNI boards and they had some of the nicest glass jobs I've ever seen.
I worked at SNI as a polisher 1977 - 78 and as an airbrusher 1981 until the company dissolved around 83 - 84. Your board was most likely shaped by Mike Slingerland or Rick Hamon. By 1978 Donald Takayama had left SNI and taken the Hawaiian contracted labels with him. SNI owned owned the Surfboard Hawaii label so it stayed there and Mike Slingerland primarily shaped them. SNI & SH boards made from 1978 until the end where shaped by Mike and Rick.
Mine is signed by Rick Hamon. Also worth noting that the art on mine is on top of the glass job before glossing.
Your board was probably painted by Jeff Grygera. Jeff went on to shape for Lighting Bolt as a licensee in the 90s and now shapes for Iron Cross in Cardiff.
Around the time SNI closed, Rick Hamon and I went on to work at Channin. A few years later, Rick got hired at Rustys. He eventually became Rustys head shaper.
Wow, I didn't think I'd get so many responses, thanks to all who contributed. My SNI was my first new board I ever had. It was $320, a fortune in 79. My mom would sneak $20 or so from my old mans wallet or she'd go without. I'd ride my bike from 3rd st Oceanside to the Hobie shop and make my payments. I loved that board. It was like gold to me. One thing about my board was the logo was not a lam like I've seen in the pics. It was under all the glass and part of the color work on the deck. It was all on one line wave shaped separating the orange from the yellow and the whole board was colored yellow up high and orange to the tail. I hope to recreate my board in the future for ole time sakes.