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Heuer LCD 980.024 User Manual *PIC*

I have an early '80s Heuer Analog/LCD 980.024 which I have just acquired.

It has an ESA 900.911 movement. This is almost identical to the ESA 900.231 used in the early Breitling Navitimers (2100/2300/2400).

I am having trouble figuring out how to use the LCD display which is controlled by 2 pushers. Can anyone point me to a manual or post operating instructions?

Many thanks in advance!

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