Mystery Sunset Beach Board

Year Built1975
ShaperWalt Miller
ManufacturerWalt Miller
Model Name
LocationSunset Beach

A friend of mine dug this board out from under his house in Illinois and sent me the pics. He picked it up in Hawaii when he lived there back in 1975. I’m trying to help him with the ID. I’ve got no dims at this point and can’t seem to find any info on Walt Miller on-line. Love the vintage leg rope! Any help with the ID is appreciated.