Sargent Duplex
Dual Shearline Master Ring Cylinder
I know, I know. It's not a padlock, but I couldn't help myself. Received this last week, picked it open, disassembled, and just finished cutting keys. I'm pretty well stocked with old Sargent blanks, but didn't have this keyway - had to slightly modify a pair of T blanks to fit.
Like the Corbin master ring, the Duplex featured a plug with an outer sleeve that allowed for greater flexibility in master keying.
A couple items of interest (at least to me)
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While Corbin's Master Ring sleeve (in rim/mortise form) is hidden from view, Sargent's is visible on the face of the cylinder.
The Duplex pictured here is standard cylinder size, as opposed to the jumbo (1.5") size Master Rings.
The Duplex's plug and master sleeve are offset from each other (almost look like internally tangent circles), as opposed to the concentric orientation of Corbin MR's. </nerdout>