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His coated blades for the Gem, Prod No. 121-3 are the best available SE blades for Gem types I'm aware of.

Ted Pella coated were considered about the best of the bunch some years ago. Not sure about now. I hear through the grapevine that they will only ship to a business address now but don't know how...

Just IMO, the Gem was popular back when I was a kid. Not as popular as a DE but they were around for years. Fairly aggressive but not a lot of good blades made for them. The standard Gem blades are...