I’m sure the Sargent #411 was introduced to compete with the Stanley #5 1/4. The Stanley #5 1/4 came out in 1922, so subsequently the Sargent #411 and #411C was introduced in 1926. The #411 was produced until 1947 and the #411C stopped in 1943.

HMike posted a #411C here, http://lumberjocks.com/replies/851679

I classified mine as a type 5. About the only variation off of a type 5 is the cutter adjusting knob is steel on this one (which I just figured out this morning during clean up).

Its Also got a cutter that doesn’t fall into any of Heckel’s type studies.

So far the #411 is the only size I’ve seen with the plane size in front of the knob. If this changes, I’ll post it here. If you have one, let me know.

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Here is a later model (1947-ish)

Cap is solid on back (1940s at least)
Cap looks to be Zinc plated (well worn, except back of cap)
Adjuster is two-piece
Adjuster screw is steel, NOT brass coated
Over all this plane looks like one of the last 411s produced and should contrast well with your older 411

 

411-Left411-Right411-Corrugated-Sole411-Steel-Adjuster-Nut411-Front-of-Frog411-Cap-Zinc-Coated411-Casting-Mouth

This cutter found on the #411 is not in Heckels Book.

Here is the Stanley #5 1/4 story