My hunch would be that it is the ex Elgh chassis 21. I have seen a Japanese magazine with chassis no 792-12 credited to Hikaru Hagiwara in the GC sportscar series, and described as an MCS II. This is in 1983, and old racing cars, once in Japan, rarely come back.
Also, we don't know where 792-12 went in 1979, suggesting that it wasn't Europe, where we'd probably have a chassis number observation.
Chris
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