Count me right in with the OP.....you found a real sweet one. Whatever you paid doesn't even count...the value will increase no matter what on these 3-1/2" beauties...AND you got all the accessories with it!
I like that classic Buick too! When I came home from 1st tour Army in 1968 I had a tough choice to make...a used but very low mileage 1966 Buick Riviera that was beautiful...then saw a 1968 Olds Tornado that had sat on dealers lot for months, less than 200 demo miles, leather, front wheel chain drive (which is why no one wanted it I guess)...made the deal and drove away.
Wish I still had it today...but I've got the other part of the equation...the 27-2 blue..shipped to Ohio on April5, 1977 per Factory Letter.
I can't believe the condition of your presentation case flocking. Your gun must have been a true safe queen all those years for that flocking to survive as it has.
If you are planning on using that gun as a "truck gun" in your excursions in the Riviera be careful when stuffing under the front seat as the power seat motor may scratch it up.