Patio Slider Lock handle.
A contractor from Crownsville , Md says:
August 27, 2015
This lever locks and unlocks the slider. There are no markings on the door or hardware , other than the glass manufacture. Thank you John
Paul from SWISCO responded:
September 2, 2015
Could I see a clearer shot of the tail on this lever? Preferably head-on. Could you also show us the mortise lock this engages with? Finally, show us a picture of the handle set, too. In the meantime, look a our 82-106 and see if this is a possible match. The only thing I'm not sure about is the tail, yours looks a little different but that just might be the angle of your picture. Thanks!