A bitsa is a local term for something, like a mixed breed dog for example, where the sum is comprised of parts from many sources.
Bits of this, bits of that = a bitsa.
I applied it to this example as I don't think it's a franken, which in my opinion is a combination of parts meant to deceive or mislead.
It may have been that your father managed to gather enough donor parts to make a watch like this.
I agree with
rolexfantastic that it's a transplant, but I'd be interested to know where all of the donations came from.
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