A carbon blade can last for months in a shake sharp.
This is just guesswork here, but I'll take a shot in the dark. Carbon blades were also only ground on one bevel, with a few exceptions, whereas stainless blades are ground on two, and in the case of Feather DE blades, even 3 bevels. In theory, the shake sharp can grind them down to one bevel, but you would either have to spend a very long time shaking, or suffer through a week or two of drastically reduced blade performance.
I really haven't tried to sharpen stainless blades in the Shake Sharp, but one of these days I will give it a fair shake. If I have tried, I really don't remember trying more than once, or with different types of stainless blades.
Okay. On to the important stuff. I got a package in the mail today.:mail: I am the proud owner of the Shake Sharp Trifecta! Now that I own the Bakelite Original Shake Sharp. It's been cleaned, but I haven't shaved with it yet. I'll post pictures tomorrow, along with a full review; and yes it will need a review. I erroneously figured that with a few cosmetic exceptions, the 1st and 2nd generation Shake Sharps were identical. I was wrong. The gold and chrome Shake Sharps were a complete redesign from the ground up. The original Shake Sharp razor has a different balance, due to the handle and part of the head being made from Bakelite, an early plastic. (Which was expected). The hone and blade tray is more of a spring assisted friction fit, rather than the powerful spring assembly found in the later model. The hone is ridged and has a steel color, rather than the brass colored hones of later models. The hone has the subtle iridescence of the diamond hones of later models and the instructions claim that it is also diamond impregnated. It has more blade exposure and a shallower head curvature than later models. I'm going to guess that this razor is potentially much more aggressive than the chrome and gold versions.
What I can't figure out is why it would have a slightly rusty Gillette Thin Blade in it.

Gillette Thins were in production until 1947 (IIRC), but that would mean that the razor had seen very little use (1 or 2 years) or it had seen a lot of use, but only with that blade (or pack of blades). Judging by the amount of wear on the blade's coating and the distinctive shine of a well honed blade, I would guess that this particular blade had been in use for at least a year or more. (I used a Gillette Thin for a month in the Shake Sharp, and it still looked new when I got bored with it and tossed it).
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