Need help identifying a side by side remington

[NinetyEight740]

Ok so I acquired a Remington side by side shotgun which appears to be very very old. I do not have the external hammers to help with identification. It says "E. Remington & Sons Ilion N.Y." on the topside of the barrel. On the rear section under the barrel it says "patent ALGD 1871 APR161872", this part is hard to read so may not be exact. All serial numbers appear to be intact of 3622 on all parts. I have attached a couple of pictures but i can take any other pictures to help in identification, thanks in advance.

[TheExpertish]

You'll probably have more luck posting this in the C&R section.