Those are great pictures of that safe. It is interesting to see the thin steps to the door and jamb and how the design evolved. Other pictures of the early screw doors are are of poor quality and I thought the slot at the center of the handle was for a key to disengage the handle. It is actually a slotted screw and the handle seems to operates a combination. 200 number dial, no less! Way cool!
I am quite positive your safe uses the Triple L time lock, and an early version at that. The early Triple L's had the keyhole for the door latch at the top of the door. With later models the hole moved to the lower right side.
The Triple K's are slightly longer and I do not believe they had a model with a left side extension for the snubber bar. There were two styles of Triple L time locks with the left side extension. Mosler used the one with the extension on the left side that exits near the rear of the body in all the screw door safes I have seen.
Another distinguishing feature is the round protrusion on the back of the body that houses the end of the linkage from the snubber bar to allow the extension to be moved to the rear. Your safe has a hole in the door to accommodate this.
It is interesting to note that your safe is not drilled for the 6th bolt. You are fortunate to have four of the time lock mounting bolts as they have an odd thread and are usually missing when they come up for sale. I also think that a triple K will have a wider bolt pattern, but I can't swear by it as I have never seen one.
GWiens2001 is correct about the flat spring engaging the trip lever if the time lock is removed. When the clocks are wound they release the retraction spring in the time lock and that flat spring moves all the linkage and puts pressure against the trip lever. An interesting note, there are actually two flats springs sandwiched together to provide added spring pressure and redundancy in case one breaks. If the spring is removed the trip lever will be held in by the threads and at the locking position it is at the top so gravity should keep it retracted. Best to have it all removed if you don't have a time lock.
