I spoke to the owner of this car last year he was looking for advise on keeping or selling pricing etc, it has been in the same family since new, if I remember correctly a son before heading to war urged his parents to buy a new car in anticipation of manufacturing stopping. It has been handed down since then. I have no idea how to value that sort of history but also understand the value is really only to the original family. To most its a car that needs restoration.
https://www.hemmings.com/classifieds/listing/1941-cadillac-61-groton-ct-2790799
Price is too high. There is a 1949 Buick Roadmaster Sedanet being discussed on the AACA Forums - Buick Buy/Sell where the price is $24,995 and it is a nice original car with 66,000 miles, and is also a Hemmings ad.
Some of the comments centered around how even though Sedanets are highly thought of, this era of car is seeing a soft market.
To me, it is always disappointing when a next generation - or in this case - several next generations - owners ask outrageous money for a family heirloom. The family has completely enjoyed the car, it has only cost them maintenance and perhaps storage, and now they want $40,000? I'm not saying the family needs fleeced, but they should join the CLC for $25, pay to have the car placed in the SS for 3 months and in this case (which I rarely suggest) take the highest offer after 3 months.
They probably feel if they get $35,000 for it they are "giving it away." Pricing cars smartly, to provide a profit or return on it's ownership, means knowing that "price sells cars."