Lefever Nitro Special Serial Numbers

I have a Lefever 'Nitro Special' double barrel hammerless 12 ga made in Ithaca, NY, serial number 273861. Is that enough information to determine the DOM? Also, under the barrel it is marked with BP over W. 4.3 vortec distributor install. LeFever 16 gauge Nitro Special Side x Side Double Barrel shotgun. This LeFever was made by the Ithaca Gun Company. The serial number possibly dates this LeFever to circa 1937.

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Lefever nitro special 20 gauge serial number

Lefever Nitro Special Serial Number Range

Hello All, I just inherited a Lefever Arms Co. SxS shotgun. I know VERY little about this gun. The only writing on it other than the serial numbers, and patent numbers is the LEFEVER ARMS CO. on each side of it. There are numbers all over it. One number just behind the triggers, one on the barrel and one on the under side of a wood piece that detatches below the barrels. I would be happy to look up the numbers if some one could tell me what I am looking at. None of the numbers is more than 5 digits long and the one on the barrel has one 'x' behind the number (which I am going to assume has something to do with the gauge of the gun from what I have read). Any help would be appreciated. May even need help looking up the serial numbers if someone wants to help. Thank you!
Barrel #0533x
When I take the barrel off the number on the other part of the gun is 20533F (there are also two funny little marks that look like plus signs in front of the number -- this may not mean anything but I thought id mention it).
The other number just behind the trigger looks like #20533
The number on the piece of wood/metal that comes off below the barrel has the number 22552 on it.
Maybe these numbers will help. Thanks again.