Austrian Anarchy's Journal: Vintage 1970s Battery Powered Calendar Clocks

This might be a question for the long, gray beards out there. I am in the throes of research on a 1970s bank bomber who managed to engineer time bombs with a seven month duration (217 days). He used analogue calendar clocks that had a day and date register. I've had no luck finding possible manufacturers, and the FBI is still withholding details because the bomber is still alive.
Anybody have any ideas besides Westclox?