Identification of Motorola Diode 56C53

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Hi all,

Sorry to do another "can anyone identify" post ...

I purchased a small bag of "18v 1w Zener" diodes at a recent hamfest.
The parts themselves have the Motorola logo and the following
numbers/letters on multiple lines:
K56C53633. I was hoping to use them to repair one of my radios. The
diode that I need to replace is on the 12v power input as a surge
suppressor/over-voltage protection device.

I can't seem to find any information on this diode to confirm the
spec's.

Any information would be most appreciated,
Dan
KZ9B