Is the Falcon Doromatic 1990 device latch the same as the latch used in the model 1690?

Yes, the Falcon model 1990 and 1690 use the same latches.  The 1690 is intended for "conversion" from the 1990 crossbar model to the 1690 "pushpad" model and the rods and latches remain the same so there is no need to remove the door from the hinges. 

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