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Welcome to TFL !
AFAIK, there were at least 4 different "Colt DA .41 revolvers" - the 1877 Lightning, the 1878 Thunderer, the 1878DA & The 1899 series.
That SN precludes it being either an 1877 Lightning or 1878 Thunderer, as it's higher than either series.
I would WAG that you have a Model 1878-DA, which in .41LC is scarce.
That said, no true value can be found w/o one actually passing hands to see how much sombody's actually willing to pay - today.
It's virtually impossible to assign a possible value w/o knowing the "condition", which is best expressed as the remaining amount of original finish + the mechanical operating condition - compared to new.
The BBGV assigns values for the Model 1878 from $500 to over $5K, depending upon that "condition" (with a footnote for a $500 deduction for a non-working action) - from 10% to 100% original condition.
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