Height: 1 1/2"
Width: 2"
Depth: 5/8" with pin part
Stones: clear baguettes
Weight: 21.6 grams
Wear: some wear to gold plating; a couple stones under metal swoosh area look odd (see close-ups)
Signed: impressed TRIFARI PAT. PEND on plaque on back

I couldn't find another example of this pin in gold tone for sale (though one in silver tone), but I did find the design patent record, see photo 2. I think this particular one is actually from right about that time, too, 1953. It has the patent pending mark with the Trifari stamp, and seems to have been worn some fair amount in its 70-year life span, some wear to the gold plating now, presumably on the "Trifarium" metal they were using then. It has tarnish, too, and I don't know what you're supposed to use to clean it, so I haven't tried. The baguettes all seem bright, no dead ones, but a couple under the swirling metal piece seem odd, visible in the magnified photos, maybe residue of polish? I think it might look better after a cleaning.

In hunting for any official name this line might have had (no luck), I came across an old magazine ad for Trifari's later Comet line, apparently sometimes confused with this pin as being from 1953, but no, that ad floating around (see photo 6) is actually from 1957, the later rather than the early 50s (which you can kind of tell from her outfit, presented as evening jewelry of the cocktail or 'prom' sort of that time). My suspicion is that Trifari (by then Crown Trifari) reissued a comet design then because they had done Meteor in the late 40s, this Comet (of some kind) in the early 50s, and in 1957 comets were in the news again a little because of "1957/d", I think later named Comet Mrkos, which was visible for several months that year with no telescope and anyone who remembered pictures of Halley's was trying to see it. I also feel quite sure this is an early 50s design, probably thought up in '52, because "Comet" was the name of the first jet liner (the de Havilland Comet), and it was an exciting new thing in 1952, as very few people had ever flown at all back then. But excitement about that Comet was short-lived, because within the matter of a year several of them went down in harrowing ways, which made international news and sent the reputation spiraling downward too, after which the Comet jet wasn't heard of again for years. So my guess is this was a comet design from '52, released in '53, but possibly short-lived after the Comet plane gave the concept some unfortunate associations.

Who knows? But it's a pretty pin, wear to the goldtone notwithstanding, and would surely be good to wear for the next actual comet pass. (Some newly discovered one is supposed to be coming this October, and possibly visible in the daytime, they say.)

Questions, just ask :)