The 1800ES wagon was only made for two years, 1972 and 1973. This '73 listed new at $5,150, or $793 more than a new Olds Vista Cruiser. Actually, the Chevy Vega Kammback wagon was closer in size and styling- though not in build quality- and its $2,323 price tag was less than half that of the Volvo. Perhaps the Datsun 610 wagon was a more effective Volvo sales-stealer back in '73; its price tag was $3,195.
This example looks pretty solid for a 35-year-old driver; I haven't seen it since, so I suspect its owner was just making a beach trip for the day.