What does the "19.01" mean?

I've seen different numbers in the same font on many circuit boards. What does it typically mean?

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Bonus points if you can identify what this device is without me posting the uncropped picture ;)
- Well, it looks to be battery powered with illuminated push button controls. Looking like it can be clipped into a base unit or detached and used remotely.
  So, my guess would be the winch and bed control for a vehicle recovery vehicle.

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