From what I can tell the PTFE coating made all the difference. Within a few years Personna, Schick, and finally Gillette were also making coated stainless blades. 1962 Wilkinson-Sword introduced PTFE-based coated stainless blades, and everything changed. So it did not do very well either, but it established the convention that "super" or "extra" indicates a blade with an anti-friction coating. The coating was fragile, and it was more expensive than ordinary blades. It was still carbon steel, so it would rust. In about 1959 Gillette came out with an early coated blade, the Super Blue or Blue Extra. Attempts included the Gillette Kroman, Darwin, and Silver Star Duridium. But I think they were also less comfortable than the cheaper carbon steel blades. Part of this was probably cost: disposable carbon steel blades were already pretty expensive and few wanted to pay a premium. 1930, but they were not commercially successful. Stainless blades have been around since ca. Maybe something about the grain structure of stainless steel? Or the passive layer of Cr2O3 on the surface? I agree that these are pretty uncomfortable to shave with. Unlike the Personna above, there is no dark band. Here is an image of one of those Silver Star Duridium. Buyers are responsible for the costs of return shipping, unless the return is due to Seller error in which case we will pay for the return shipping.I agree. Items must be returned via a shipping service with delivery confirmation and insurance. All returns must be received in the same condition in which they were sent and in the original packaging. Please contact us to let us know that you will be returning the item. You may contact us for a shipping quote or you can use the International Shipping Calculator.Returns for a full refund are accepted within 14 days of purchase. Please see the details in the individual listing for services offered. Please see the details in the individual listing for shipping method offered.All International Orders are insured and are shipped via a USPS International Shipping service. Please make sure that your address information is current and correct so we can get your item to you as soon as possible!All US Orders are shipped via a USPS service with tracking information and delivery confirmation. Items will be shipped to a registered Paypal address only. ![]() Although Business days do not include weekends or USPS holidays, we do ship on Saturdays when possible. We understand that unexpected things can happen, so please contact us if you will not be able to pay for your item within the 4 day time frame and we will do our best to accommodate your situation.If you are purchasing more than one item or are bidding on more than one auction, will will be happy to combine shipping where possible on all items purchased within a 7 day period.ShippingYour item will be shipped within 1 business day of our receipt of your cleared payment. If you have any problem with your item once you receive it, please contact us and we will do our best to resolve it to your satisfaction.See my other listings for more great items! PaymentPayment via Paypal is expected within 4 days of the close of auction or the date of purchase for "Buy it Now" listings. We ask that you read the description and look carefully at photos and if you have any question at all, please ask us before committing to a purchase. Thank you for visiting our auction, please add us to your favorites and don't forget to check out our other great auctions!!!!***We want your buying experience with us to be efficient, positive and fun! To that end we do our best to carefully examine and describe our items in detail-including any defects-and provide multiple photos so you can see exactly what it is you are bidding on/purchasing. Please check with your country's customs office to determine what these additional costs will be prior to bidding or buying.***If you have any questions or would like additional information, please let us know and we will answer promptly. These charges are the buyer's responsibility. ![]() Items pictured are the ones you will receive.If you would like additional photos or details-just ask and we'll be happy to respond to your request!***International Buyers- Please Note :Import duties, taxes, and charges are not included in the item price or shipping cost. Made in England.Please see photos for a closer look at the condition details. Vintage Wilkinson Sword Chromium Edge Razor Blade Pack of 5DescriptionThis is "new old stock" pack of 5 Wilkinson Sword Chromium Edge Razor Blades.
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