I have several Greeners,not an expert, But--
The gun has been refurbished in appears in England and appears to be an F40 Model, probably 1885-1895. With the chokes mentionedthe bbls were probably honed out before the Nitro Proof to have it acceptable for Proofing.I think it is slightly overpriced but Cabelas is typically negotiable as they always price things at the top of the market.