Not a legit Abarth, just another 600D/E chassis with a few "Abarth" parts (real & repro) put on it. Also, the VIN corresponds to a late-1966/1967 chassis, a very late car to have such tame modifications done to it.
Repro front grille, with side whiskers installed too low. Repro hood ornament. 600E/R type bumper overriders. Incorrect front fender emblems, wrong type & placement of script emblems on rear decklid, wrong placement of rubber T-straps on front & rear, fake "Abarth 850" engraved switch plate & "Abarth" stamped exhaust surround plate (both never existed), "Corsa" type gauge housing in a "Stradale" car? Mismatched gauges. Fiat 1500 type tach-drive fitting on timing chain cover rather than Abarth type on distributor. No rear decklid props? Alloy radiator fan is missing 4 blades.
The ad goes on about "a front oil radiator, front brake discs", but this car has neither. It also states the car "is in an excellent condition from all points of view", but the floor mats are grimy, many interior items have surface rust/grime (ashtray, switch plate, gearshifter, e-brake lever, etc.), & the engine bay is dirty & has 2-3 different colors of paint that is cracking badly everywhere.
No mention of what engine it has (Fiat 600D? Fiat 850?), nor any engine modifications done besides the visible larger carb & 4-2 exhaust.