I did some research into this and there is an option code called "BX1" which is called "Special Ornamentation frt end spl" which is the code for the hood ornament. This car has that code on the RPO sticker. Thus, GNs could in fact come with hood ornaments, although I'm sure most of them didn't. Just one more thing making this car unique and special.
There is also a thread on the board somewhere which discusses this.
Just to start this post off positively (it'll end this way too)--this car is SWEET--the nicest '84 GN I've seen since they were new.
Now, about BX1. This RPO became a pretty hotly debated topic earlier tonight at my local BCA meeting where a number of other GN owners and I chewed the fat on this over some coffee and such at the local eatery that puts up with us taking up way too much of their parking lot.
One of the guys brought his RPO book (published by GM in 1990) that covers G-bodies across all GM lines and other platforms too. The full desription of BX1 is "ORNAMENTATION, EXTR FRT END, SPECIAL EMBLEMS." The concensus was that BX1 refers to the Grand National emblems on the front fenders. My '87 GN has RPO BX1 on the Service Parts Identification Label on the underside of the decklid-- the car doesn't have a hood ornament, nor do the other three GNs (2 '86's and 1 other '87) that were all parked together tonight--yes, with BX1 on their SPI labels too.
So, does this make any difference as it relates to this beautiful '84 GN. Most likely not if there are no signs of front end damage (core support pull or replacment, frame horn damage, etc.). Myself and one other fellow BCA member have seen another '84 GN (about two years ago--another low mile car--different VIN) for sale at a dealer in Houston--same outfit trying to sell the 9 mile GNX for $110,000 on eBay now for 6+ months. It too had the ornament and a lot of people doubted the car's originality because '84 Buick order guide info. notes that the hood ornament was not available on the Grand National in '84. The GN Facts and Figures Book II, page 135 shows two profile diagrams of the Regal, one "Regal, Regal Limited-Sedans" and the second "Regal T-Type, Regal Limited-Coupes." In the lower (second) diagram it reads "Stand-up hood ornament (std) (N.A. on Grand National).
So again, this and a cup of that coffee we all drank tonight will buy you an opinion. If the car shows no signs of collision damage it was probably an inadvertant assembly line "special treatment"--mistake. These happened--just grab the wrong header (with a whole for a hood ornament) before the part sequences to the paint department and what you get is a car that actually has more collector appeal as it was faster to put an ornament in that hole then to move the car over to repair at the end of the line. If the previous owner has pictures of the car when new that would really document things nicely.
Net/net, the heck with it. Someone's gonna get a great GN with nicer paint than any of us orange peel lovers!