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Azmüsebat ... you know, the parent company behind Derby.
Global offerings appear to be the well-known Derby Extra, the also well known Derby Premium and the more esoteric Derby Usta ... but let's hear from Derby themselves as to the differences:
Source: https://www.badgerandblade.com/forum/threads/difference-in-derby-blades.658120/
So, three grades ...



Important to note that the Derby Premium displays the words "Swedish Steel" upon the face of the tuck and this will be the higher-quality Sandvik Steel. Whether the other blades are not of this grade is questionable but they do make a deal of this with the Premium ... and just one of their private label blades.
To my face, there are indeed differences and my interpretation is as follows:
Derby Extra - Baseline … more smooth than sharp in character and a good shave
Derby USTA - Mid-range … definitely sharp over smooth and potentially delivers a closer shave
Derby Premium - Best of both? ... grade of metal delivering both a sharp, close shave with some refinement
Azmüsebat also make a host of private label blades which for the purposes of this guide I have divided into two categories - one group more akin to the Usta and the other group more akin to the Premium. None of these are like the Derby Extra in character and I suppose we there can consider the Derby Extra to be Azmüsebat's flagship blade (yes, rather than the Premium).
First group ... more like the Derby Usta:



All three of these give really nice shaves and actually none of them are exactly like the Usta but they are all certainly sharper than the Derby Extra but all without the refinement of the Derby Premium. The Bluebird Hi-Stainless gave what I think was the sharpest of these three but left some post-shave irritation, certainly on the first and second shaves ... while the Lion Super Stainless was the pick of this bunch for my preferences delivering a sharp and close shave that put me much in mind of the good SuperMax Super Stainless blades. I'd pick the Lion Super Stainless above the Derby Usta.
Second group ... more like the Derby Premium:



Again, all three gave lovely shaves and my reason for grouping them as akin to the Derby Premium is because they deliver what I'd say is a more refined shaver. Certainly the Parker Premium Platinum is (in my mind) absolutely the Derby Premium specification and right down to the statement of Swedish steel (on Parker's website although not on the pack) while I'd say the standout from this group is the Diamonds Pro Excell which I would pick above the Derby Premium as I thought it delivered a far better balance between sharpness and smoothness ... on my face, anyway. I've put the Lamix Platinum Plus Pro 5 into this group as well although I think this is a much older blade (and discontinued) ... I certainly think it's a premium-class blade.
Final thought is a summary chart from the sharpness testing undertaken on B&B which you can read all about the methodology here: https://www.badgerandblade.com/forum/threads/blade-sharpness-research-project.652790/ and even lookup these blades for some further detail and discussion within the thread.

Global offerings appear to be the well-known Derby Extra, the also well known Derby Premium and the more esoteric Derby Usta ... but let's hear from Derby themselves as to the differences:
While all three blades are made by Derby, there are notable differences in terms of sharpness, coatings, and performance:
Derby Extra: This is the most gentle option, offering a milder shave, which makes it great for beginners or those with sensitive skin. It’s less sharp compared to the other two, which helps reduce the risk of irritation.
Derby Usta: The Usta blades strike a balance between the Extra and the Premium. They are sharper than the Derby Extra, providing a closer shave while still being smooth and forgiving. It’s a good mid-range choice for those looking for something sharper without being overly aggressive.
Derby Premium: This is the sharpest of the three and comes with a higher-grade coating, including platinum, which enhances both sharpness and durability. It’s ideal for those with thicker or coarser hair and is often preferred by experienced shavers.
Source: https://www.badgerandblade.com/forum/threads/difference-in-derby-blades.658120/
So, three grades ...



Important to note that the Derby Premium displays the words "Swedish Steel" upon the face of the tuck and this will be the higher-quality Sandvik Steel. Whether the other blades are not of this grade is questionable but they do make a deal of this with the Premium ... and just one of their private label blades.
To my face, there are indeed differences and my interpretation is as follows:
Derby Extra - Baseline … more smooth than sharp in character and a good shave
Derby USTA - Mid-range … definitely sharp over smooth and potentially delivers a closer shave
Derby Premium - Best of both? ... grade of metal delivering both a sharp, close shave with some refinement
Azmüsebat also make a host of private label blades which for the purposes of this guide I have divided into two categories - one group more akin to the Usta and the other group more akin to the Premium. None of these are like the Derby Extra in character and I suppose we there can consider the Derby Extra to be Azmüsebat's flagship blade (yes, rather than the Premium).
First group ... more like the Derby Usta:



All three of these give really nice shaves and actually none of them are exactly like the Usta but they are all certainly sharper than the Derby Extra but all without the refinement of the Derby Premium. The Bluebird Hi-Stainless gave what I think was the sharpest of these three but left some post-shave irritation, certainly on the first and second shaves ... while the Lion Super Stainless was the pick of this bunch for my preferences delivering a sharp and close shave that put me much in mind of the good SuperMax Super Stainless blades. I'd pick the Lion Super Stainless above the Derby Usta.
Second group ... more like the Derby Premium:



Again, all three gave lovely shaves and my reason for grouping them as akin to the Derby Premium is because they deliver what I'd say is a more refined shaver. Certainly the Parker Premium Platinum is (in my mind) absolutely the Derby Premium specification and right down to the statement of Swedish steel (on Parker's website although not on the pack) while I'd say the standout from this group is the Diamonds Pro Excell which I would pick above the Derby Premium as I thought it delivered a far better balance between sharpness and smoothness ... on my face, anyway. I've put the Lamix Platinum Plus Pro 5 into this group as well although I think this is a much older blade (and discontinued) ... I certainly think it's a premium-class blade.
Final thought is a summary chart from the sharpness testing undertaken on B&B which you can read all about the methodology here: https://www.badgerandblade.com/forum/threads/blade-sharpness-research-project.652790/ and even lookup these blades for some further detail and discussion within the thread.
