1971 Ferrari 365 GTB/4 Daytona Spider Conversion on BAT?

I cannot answer the question re costs but each cut Daytona is different and then it also depends if the owner/client also requires a total ground-up restoration at the same time or not.
Here's 12419 nine years ago.

Marcel Massini

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Is that 12419's original roof?

 

Supposedly.

Marcel Massini

 

Here is a plan - hook up Daytonas with shops that build “ fake “ swb , cal s , tr, etc


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Sold for $700k.

 

Here she is 2 years ago, for sale in Germany by Shaltkulisse


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Black side stripe is missing. Also the small circular amber light on the fender near that side stripe. And the small squarish white lights positioned on top of the front bumpers in the corner. Steering wheel is incorrect (should be wood).
Below is the same car, 12419, in 1969 at the IAA Internationale Automobile Ausstellung in Frankfurt (Germany). International Motor Show, just 55 years ago. 12419 is the second production Daytona built, after the German show it went back to Italy and was sold to its first private owner, a race driver. The 3rd pic shows 12419 in Germany 2017.

Marcel Massini

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wow!!!

 

A remarkable result, hopefully genuine.

 

I agree & IMO, significantly less.

But then again, that’s I feel about all fake Cal Spdrs, GTOs, SWBs, etc.
In my eyes/mind, all else being equal, each is worth significantly less than the donor car they were mutilated from.