What Does A Blue Dot on Engine Mean?

[Homeboy981]

I shudder to ask this question but...does anyone KNOW why there would be a BLUE DOT on the engine case (in front - between the crankshaft and idle pulley) by the serial number/engine number?

GULP! Anyone else seen this? It has lived on the west coast, if that helps. Just hoping it's a factory marking or that it has been "blueprinted", hence the blue paint….just don't say a re-build?

Looks like the original water pump at 65,000 miles. The rest of the car is bone dry leak-wise, no visible "krinkle-marks" either from being cruppled up. Minor curb damage in front only.

Any ideas? Will post a pic if nobody can I.D. why it would be there.

Lastly, where can I find out IF the engine in my car is the one the FACTORY put in?