No marking as you can see and I don't know the mfg. Of the door
A quick learner from Windham, nh says:
March 8, 2016
Handle no longer works. Would like to replace. Please identify so I can order from you.
Tom from SWISCO responded:
March 10, 2016
I would recommend looking at our 40-150. It looks like you might be able to get away with just replacing this inside handle, since it is what contains the spring mechanism. See what you think.