Was it you?
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I was looking round it and noticed it hasn’t got the screws into the roof from the buttress’s.
This web page reckons the screws were added at car #72 or #73
I love searching out these little gems, as I was wondering why mine had no screws.
Not mine…though I do have one rather similar 
#192 here without the screws!
I understand the first production of cars didn’t have them, also that each car was not always built in chassis number order?
In addition to adding lightness, this rare spec must surely add ££££’s to the value…… 
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That’s interesting, thanks for sharing. Of course Lotus wouldn’t build them in order 
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