Schlage "G" series.
I've only seen 2 of those in my career.
One was years ago, I took it off to convert the door to use a standard knob and deadbolt. It had been repaired a few times and the client wanted to upgrade to new locks,
and one just last week. This one I got to keep. I got it for $20.00.
I found everything about it in an old Schlage Service Manual. I got the description, exploded views, lubrication chart, even instalation instructions. It was already discontinued in 1981, the year the manual was published.
Apparently, it was a very expensive lock in the 70's and of a very high quality.
I must say that I have to agree with the quality, The gentleman from whom I purchased it was using it since 1975. It's nearly as old as I am and it still works perfectly. (I wish I could say the same about myself). Too bad Schlage discontinued it.
I guess the cost of metals and labour became prohibitive.
-It's latch and latchbolt are interconnected, meaning, turning the inside knob retracts both, the latch and bolt for easy egress.
This one is in a very nice, one popular, bronze hammer tone finish.
It shows a bit of weathering but as with all bronze, it helped in developing a beautiful patina.
No plastic here, all metal construction and it's weight is pretty significant at about 15 lbs.
The deadbolt is thrown by the means of a thumb turn from the inside and the key from the outside.
In addition, the knob can also be locked with a small button in the inside knob.
The cool thing about the locking knob is, when locked, the outside knob spins free, 'round and 'round.
I guess it prevents breakage of the locking mechanism and is effectively vandalism resistant.
I took it apart to service it and took a bunch of pictures.
Friends, here is a vintage Schlage "G" series lock set, "undressed"...
http://s1155.photobucket.com/user/Altas ... G%20series
M.