Hi everyone!

I have a Calisia upright piano and I want to get to know what is the serial number of it.
I've found 2 different numbers, but I am affraid, none of them is a serial of the piano.
One is on the iron-cast frame (-10512), and the another is on the soundboard (081410).
If the number from the soundboard was the sreial of the instrument it might be produced in 1978 year.

I know that sometimes particular parts have its own serial numbers.

How can I be sure which number refers to what?

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