Omega couldn't use "Omega" branded watches in Canada other than their Dealers. So, to get their watches out into the hinterland and across the Canadian Provinces/Territories to as many jewelers /others as possible, they used Regina as one name fronting their movements.
Differing grades/sizes to be sure, at all price points.
This 18s Regina fronted Omega's "almost" top chronometer graded movement. The best was their DDR grade at 23j and mine is a tick below at 21j. Dropped 2 jewels and a diamond or two but all the other features are here, as are the extra fine finish to the parts. High precision, indeed. I'd call it a DR+ since it has 21 not 19j.....(D<DR<DDR)
After service and regulation, +/- 2-3 seconds/day, stem facing right, on a stand, wound fully once a day. I did that for a few days for kicks and grins.....and it was raining those days.
Omega called it a graduated "snail" regulator and they are only seen in DR and DDR movements. They sent all DDR movements to be certified as Observatory Chronometers.
As seen in one picture, my serial # 2451289 falls in 1905 and Omega didn't recognize it as a DR, and shipped it to Canada to be cased and sold outside their Dealer network as a RR grade watch.
"Superior Adjusted" was used prior to RR regulations changed to require: "adjusted to 5 positions, temperatures" however, from one picture I posted, there is one more Regina(not as finely finished, and a Private label Canada) on Google via a Watch Forum 59,033 units apart(younger) and it has adj 5 positions stamped. So, this is roughly when all the hubbub from the Regulators started, I guess.
Yes, I said "one picture".....try to find more than 2-3 Regina's finely finished like mine, 21j with a snail regulator on Google. I'm cross-eyed from looking. I've posted one (British American Watch Company from this Forum, no less!) but it is a Private Label(Canadian Jeweler but very finely finished). And I posted another in a golden colored case, also very finely finished but no picture of the dial was on that Forum to grab.
Maybe a bunch are in bank boxes all over Canada or in grandpa's trunk. These are well built, high precision, mechanical instruments. Factory produced just not in high numbers, I guess.
Mine is a true Hunter movement because it has the setting lever at 26 minutes.
The case is "of the period" and maybe slightly before and made by the Illinois Watch Case Company, the arrow trademark says otherwise if you take the Pocket Watch Data Base as the last word. It even says these should be chrome-plated from the late 1930's. However of the few "arrow" cases I saw online, my 5-digit case number is extremely before any of those and with it in hand seems to be a white gold plate or fill.
But it housed at least one other movement from the indents shown.
Handsome one way or the other in my book.
@Canuck doesn't our two dials look alike!!!.....(other than mine has a shorter name so not to clutter up such a pretty double sunk porcelain, er, Vitreous Enamel dial
😁) I would say identical fonts. Hands too! other than the minute.