Rebarreled Parkers

[78CJ]

I have been negotiating with an acquaintance on a lever rifle for a few days when he mentioned a Parker he had that he did not want. Assuming it was a 12 Gauge V Grade I was surprised when he told me it had "birds" engraved on it. A few pics later I was able to surmise it had been blued at some point and I believe the stock (English) has been replaced. It has a single selective trigger.

My question is, the barrel says Made In Belgium under the for-end and has "Re-barreled by" (can't make out the rest in the pic) on the right side. The barrel has Belgian proofs.

How does that relate to value? I assume between the re-blue and non Parker barrels it falls pretty low? Was this common practice?

Thanks

Ryan