tldr: Your pictured typewriter looks really clean and nice but any rarity it embodies will not affect its value.

"Rare" doesn't mean much in the typewriter realm. The machines that are truly rare are pretty well-known and the ones that are not already known won't be of much interest simply because they aren't known. And minor variations of mass-produced machines are not of interest (except sometimes to completists) and Smith-Corona is notorious for variations in only the decoration. (I note that your pics are of a Super 10, not a Special 10, so is there already some confusion about your find?) The greatest interest in variations seems to be in the colors, like the "Cop Car" Remington which seems to be less common the the Chocolate ones.

At the same time, there are numerous variations in the works with no signal at all about it, like the change in the Galaxie ribbon cover from the sliding mech to the hinged design. And nobody cares about that either.

"someone on the Typewriter Database" might be a complete newbie trying to be helpful or a knowledgeable but fussy completist---we don't know. There aren't really production numbers and even if there were, it's unlikely a factory would track minor variations within a year's production of Coronets. The closest you can come would be to do math on the serial numbers available.

Interesting questions, though.

Michael effectively answered the OP's questions with very good points.

From my own perspective, rarity (perceived or actual) is always trumped by practicality: I'm only interested in buying typewriters that I can actually use as opposed to functioning only as shelf décor. As a result I would pay less for the typewriter in question - if I would buy it at all - because it uses Smith-Corona's proprietary ribbon cartridge. Sky might like them, but I sure don't like buying them, which is why I normally limit myself to earlier Smith-Corona electric models that still used standard 13 mm ribbon.