Factory?

Never...prefer it with the C-pillar opera window.

New to me as well.

I had that same roof, in your last photo, on my Monte Carlo. But looking at pic #2, interior, I'm not sure it's factory. The 2nd Gen Regal, (1978) had the opera window  for '78 & '79 but it was gone by 1980 and that roof is different altogether. This one's mysterious!

My 73 Oldsmobile Cutlass Supreme had the opera window as well. Loved the car but then sold it to my brother who had a Condo without a garage and in a few years the car was in terrible shape. I always felt sorry for the car as if I had betrayed it.

@bob-jackman 

I've often had 'feelings' for my machinery as well. I try to keep everything I own, in impeccable condition - lawn mowers, tractors, trucks and, especially, cars. If they are special and close to me, I'm not above naming them!

Posted by: @perrone1

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But looking at pic #2, interior, I'm not sure it's factory.

This car is currently for sale and is (obviously ) a bit beat up - which explains why everything seems "loose."    Yet, every other interior pic I can find matches what's in pic #2, except, of course, for the absence of that window.   

That being said, pic #2 does look like material, whereas all others - with that window - seem to be plastic.      The plot thickens.  🤔 🤔 

Posted by: @bob-jackman

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I always felt sorry for the car as if I had betrayed it.

Exactly, cars have feelings too!    MANY times, I've said goodbye to - and even cried over - cars I've owned!  

I'd say it's been filled in and painted over. I've never seen one without the opera windows. The material on the inside looks a little rough as put in. JMHO though. 😊

Back to the Regal, if memory serves, I recall that Buick did a special Regal with a patriotic theme with a vinyl top that covered up the opera windows. We still lived in St. Louis at the time. Perhaps this was a zone type promotion? Anyone else remember this?

@bob-jackman, I do. Hurst covered over the opera windows for their Hurst Olds versions as well. This is not factory but an aftermarket conversion. The window openings on GM's A bodies were stamped into the C-pillars.

Here's the Buick and an Olds.

@jkuvakas Yes I remember the Hurst Olds conversions. Thanks for the reminder.

... I too am inclined to believe that someone - for whatever reason - filled in that opera window.   If not, could this be something rare?   Perhaps.  🤔    Something valuable?  Probably not.  😔 

The "opera window" as referred to here, was NOT one of my favorite roof styles.  If the car pictured is "factory", I like it better.