This gun was very incorrectly advertised on Gunbroker as a rare variation.
https://www.gunbroker.com/item/885208786It is really just an E Grade that has been restocked and very poorly and incorrectly refinished.
The seller claimed that serious collectors told him that the beavertail forend was original and rare. Lefever never built a gun with a beavertail forend. Period. The case hardening colors on the frame are polished off, and it has been incorrectly nickel plated. No Lefever shotguns were ever nickel plated. The sideplates which were also originally bone charcoal color case hardened have been blued. This was NOT a special order feature, as the seller claimed.
The weep holes in the lower rib indicate that these barrels may have been hot blued, which can be very bad and cause the solder joints to fail. There is a good chance that the second set of barrels was purchased by the original owner from Lefever Arms Co. because one set has two different serial numbers. This was an original practice. It is a shame that a two barreled set has been desecrated in this manner.
The stock is almost certainly Black walnut. All Syracuse built Lefevers had English walnut stocks. This was not stocked by Ithaca. The style is all wrong.
Sorry to give you all of this bad news. It would cost way more than it is worth to correctly restore it. The seller covered his ass with his admission that he is not an expert. The next time you buy a gun, it might be a good idea to get accurate information before you spend your hard earned money. I'd advise you to sell it as is , and cut your losses.