Some of the vehicles in The Portfolio Collection being sold at auction.

A stunning array of iconic classic cars and supercars are expected to fetch over NZ$100 million when they go under the hammer in August.

RM Sotheby's is calling the auction "The Pinnacle Portfolio - an unrepeatable opportunity" and it is hard to argue against that claim.

The 23 vehicles are all part of one person's collection - reported to be an un-named businessman from Florida in the US - and will be auctioned on August 13 as part of the world famous Pebble Beach Concours d'Elegance week in California.

RM Sotheby's says the portfolio is a "rare collection of automotive distinction" and will be the most valuable single collection of motor cars ever presented at auction.

"While many of the world's most impressive collections were established in the public eye of the car-collecting world, The Pinnacle Portfolio was assembled with a clandestine, surgical precision unlike any other that has come to market," Shelby Meyes, a car specialist with RM Sothebys, said.

"Its almost obsessive focus on perfection, rarity, and the superlative, irrespective of price, makes it the most significant and valuable private collection of motor cars ever presented at auction.

"From Ferraris and Lamborghinis, to Bugattis and Porsches, an offering of this importance and rarity is absolutely unprecedented."

A 1964 Ferrari 250 LM by Scaglietti to be auctioned as part of "The Pinnacle Portfolio". Photo: PATRICK ERNZEN/RM SOTHEBY'S

The 1998 McLaren F1 "The Road Going LM" to be auctioned as part of "The Pinnacle Portfolio". Photo: PATRICK ERNZEN/RM SOTHEBY'S

It is hard to finger which of the vehicles - nine Ferraris, two Mercedes, two Bugattis, two Lamborghinis, two Porsches, a Saleen, Koenigsegg, Jaguar, a Maserati, a McLaren and a 1967 Toyota - will top the auction but a road-race hybrid 1998 McLaren F1 is tipped to fetch NZ$17m while a 1964 Ferrari 250 LMs is considered one of the finest in existence.

The 2005 Ferrari Enzo gifted to Pope John Paul II. Photo: PATRICK ERNZEN/RM SOTHEBY'S

Another interesting offer is the 400th and final Ferrari Enzo built which was gifted to Pope John Paul II. It has just 289 kilometres on the clock.

The Enzo is considered a one-off with factory-delivered options and comes equipped with a carbon fibre rear spoiler, Daytona seats and an inscription by former Ferrari Chairman Luca Cordero di Montezemolo and blessed by the late Pope John Paul II under the bonnet.

The car was later auctioned on Pope John Paul II's behalf with proceeds supporting the relief of tsunami victims.

A 1993 Jaguar XJ220 that will be sold as part of The Pinnacle Portfolio auction in August. Photo: PATRICK ERNZEN/RM SOTHEBY'S

There is a rare 1993 Jaguar XJ220 driven just 2900 km from new. It is one of 281 examples ever built and one of only 10 fitted with brake boosters by the factory.

The first production Bugatti Veyron being sold in The Pinnacle Portfolio auction. Photo: PATRICK ERNZEN/RM SOTHEBY'S

A 2006 Bugatti Veyron 16:4 is the first production Veyron ever built. It has travelled just 1229 km from new and is book-ended by a 2012 Bugatti Veyron 16.4 Super Sport that is chassis number 300 being the last of that model's production run.

A 1955 Mercedes-Benz 300 SL is one of 29 original aluminum-bodied Gullwings produced and retains all original mechanical components

A 1971 Lamborghini Miura P400 SV by Bertone has undergone full restoration and is a matching-numbers, single-sump example that is considered one of the best Miura SVs in existence.

"THE PINNACLE PORTFOLIO"

-2006 Bugatti Veyron 16.4

-2012 Bugatti Veyron 16.4 Super Sport

-1959 Ferrari 250 GT LWB California Spider by Scaglietti

-1964 Ferrari 250 LM by Scaglietti

-1967 Ferrari 275 GTB/4 by Scaglietti

-1985 Ferrari 288 GTO

-1972 Ferrari 365 GTB/4 Daytona Spider by Scaglietti

-1974 Ferrari Dino 246 GTS

-2005 Ferrari Enzo

-1994 Ferrari F40 LM

-1995 Ferrari F50

-1993 Jaguar XJ220

-2008 Koenigsegg CCXR

-1971 Lamborghini Miura P400 SV by Bertone

-2008 Lamborghini Reventon

-2005 Maserati MC12

-1998 McLaren F1 "The Road Going LM"

-1955 Mercedes-Benz 300 SL Alloy Gullwing

-2005 Mercedes-Benz SLR McLaren

-1956 Porsche 356 A 1600 Speedster by Reutter

-1988 Porsche 959 'Komfort'

-2005 Saleen S7 Twin Turbo

-1967 Toyota 2000GT

More details on The Pinnacle Portfolio here.