The HX Sandmans were not available in 6-cylinder configuration at the time your utility was built. They had been discontinued earlier in the year due to extremely low sales and only V8 vehicles were being made.
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I don’t know if this is entirely right....it’s a 3/77, if above is correct and the 6cyl stopped in that month as I also have a 2/77 HX Sandman 6yl with 18V Trim. If it is correct then my 2/77 could be the last one made.