A "V" was only an indicator for 1972. Documenting an original 1971 Stage 1 car would require original paperwork (POP, build sheet, window sticker) and a good look at all the stampings.
No V in VIN because it is a 1971. 5th digit designating engine code in VIN did not start until 1972. Super cool rarely seen color combo, looks great.
Car is back on eBay with a buy it now price of $50K. https://www.ebay.com/itm/1971-Buick-Gran-Sport/133181447393?hash=item1f023b9ce1:g:umwAAOSwSetdiV52
Back on eBay again. I figured this car was scooped up the last time it was listed. Apparently not. https://www.ebay.com/itm/1971-Buick-GS/133283891894?hash=item1f0856cab6:g:sc4AAOSwE19eAnYl