Well, it's been eight months since anyone (me) posted to this former "sticky" thread.

I had been looking for fatter, treaded rubber for my New-Years Day Bridgestone submariner that has been seeing mixed and off-road duty, so yeah, it's being used as a "hybrid" and I finally pulled the trigger on some tires which have been impossible to source stateside.

I finally found a Hybrid "37mm" (or more realistically, their labeled and actual 1-3/8" width) tire with deeper tread than anything 27" that is actually this wide.
Previous Kenda 1-3/8" tires measured an actual 29mm on touring rims, but these Cheng Shin C-979D tires will measure an actual 35mm wide on 27" touring rims.

The tread is what I remember as the Specialized Nimbus tires that came on my 1991 Specialized Crossroads, except those were "41mm" wide (also made by CST though).

These are good tires for riding at lower pressure, though still rated for 85psi.
The tread is "open" along the center, so will wear fast in the middle if ridden at relatively high pressure (that's not what these tires are about imo).

The source is Alibaba, and the shipped price is just $17 each (I bought six). Two weeks delivery approximately, wrapped three to a package and unfurled into straight-looking tires none the worse for their travels.
Alibaba's search engine wastes your time, a 27" tire query brings up hundreds of bicycles.
Phoeny bike shop Store

Pictured mounted on a medium-narrow rim that's 15mm inside width, so only showing 34mm outside width at rated pressure, after 24 hours.