My friend made my recipe using TFA Turkish, and it is infinitely better than with any other tobacco.
I feel any Centurion is a safe bet. I think that Civic-era Centurions were leftover stummels, and were sold by Civic until they were gone, much like transition period Barlings were. I also feel that the encircled Made in England is a giveaway that it's a Haymarket era piece. I have only seen one Centurion that was sold as being a Civic era, and I noted no visible differences between it and a Haymarket Centurion. I don't think we're talking big numbers with Civic era Centurions, and my best guess is as stated above.
Early Civic era also has the shape name stamped on bottom of shank.
that or a rebrand of one of their regular series for a different market or tobacconist
I bet they're newer Cadogan manufacture, they'd have to be
My belief is that the standard series pipes with L&Co on left shank and Original or Standard underneath are Civic era. There appears to have been a transition period with Loewe, as some of these have superior stems as the Haymarket pipes did, and some are abysmal, which I will attribute to Civic manufacture.
Just to play it safe, if the pipe has simply L&Co on the left shank and nothing else, and the shape name printed on the bottom of the shank, winner winner chicken dinner. I don't trust any Originals or Standards not to be Civics in disguise. All Centurions appear to be safe, and the one blast I have is good as well.
I would guess that this would be one of the last years before they switched to three digit shape numbers. It would be early Cadogan era. The Captanide is the Loewe designation for the Prince shape. There is a good likelihood that Loewe was the creator of this shape and was then copied by all the rest. In any event a Loewe Captanide is the most desirable of all Prince shapes IMO.
Royal Sovereign was an Orlik seconds line. Same catalog shapes as Orlik, just lesser grain and molded stems. Early on, lower Orlik lines had hand cut stems just like the higher lines. Not sure if this was the case with early Royal Sovereigns or not. In any event, like any Orlik they're bound to be great smokers.
Put it on eBay by itself. Depending on the condition you may get upwards of $100 for it. I've paid $15 for Loewe estates, and I've paid $200 for Loewe estates. You'll get market value by listing it on eBay, but market value depends on the condition of the pipe. Good luck!
I would contact Cadogan. There is very little Orlik info on the web.