Huzzah! My Reginas are finally done! Took a few weeks, but the rehabbing process was surprisingly therapeutic. As an experiment, I used Blackrock on the black one and Renapur on the tabac/British tan? one. Honestly, I don't mind either, but I did struggle a wee bit more using Blackrock, but mainly because I didn't exactly know the correct method of application. The horsehair brush really did save the day though, giving both bags a nice shine. Also, no one mentioned how fun buffing leather can be! I found myself enjoying it way too much, hahah. Here's a side-by-side comparison of the bags.
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A closer look at the tabac Regina, using Renapur after a few coats of CPR.
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I previously shared photos of the black Regina, but here she is again. With one coat of Blackrock.
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I will say that the leather on the black Regina is a lot more buttery soft than the tabac. But that could also be due to the bag being more 'broken in'. As for the tabac bag, even though there may be some darkened areas (like patina or something), which I didn't manage to remove, it's still a beauty and I'm really happy with how they both turned out!