So further research shows that 195996 is the driven gear on the LP (printer) main shaft.

above from 573-115-800 at the usual website

From the installation instructions (573-100-201)

So what is call the driving gear above can be any of 3 numbers, 195999 for 60 speed, 195993 for 75 speed and 195997 for 100 speed.

Page 35 of:

https://navy-radio.com/manuals/tty/573-116-800-iss3-7107.pdf

shows

so it's likely that 195996 is the driven gear for 100 speed.

Strangely going to the index to see if 195996 showed up on another page, it wasn't listed.

The speed has me stumped, the large
gear has 195996 stamped on it, but I
cannot find that part anywhere in
any of the gear parts lists I have
found, about 5 lists.

elivered to [email protected]

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The above comments or recommendations are SWAG. Use at your own risk.

John, W9DDD