have done a little research, and will go out on the proverbial limb and say that it is some variant of the "monte carlo" pigeon gun...am basing that on similarities to this gun currently offered on gunsinternational;

https://www.gunsinternational.com/g...nte-carlo-a-ejector.cfm?gun_id=103159291

lock pins conform, and basic shape of bars also - many differences in shaping final details, and i have had a recent education regarding the multitude of such changes that were available thru scott/webley.
most folks are familiar with only the monte carlo B, with it's bird on each lockplate - but there is an A as well. i have also learned that for a brief period in the earliest production there was a monte carlo with no A or B...i've owned one of those 40 years.
my 1892 gun is identified by a legend on the rib, and my 1902 gun is like the example i have linked - the identification is located atop the tubes. both those locations have been removed from your gun - and i would say that it has been hot blued, and that insult likely included the barrel set....which would explain their poor condition.

and, i would echo jr's wise advice...this gun is pretty far gone, and would be very costly to try to return to any degree of quality.

"it's a poor sort of memory that only works backwards."
lewis carroll, Alice in Wonderland