Colt 1878 DA 2nd year production

Snagged this on GB awhile back. Made in 1879. Factory letter has been ordered. A couple of neat things going for it. It has the Hartford/London barrel address but has no British Proofs. Caliber is .45lc. 1st style (non-serrated nut) fat wood grips on the oversize grip frame. Not in pristine condition, probably 40%-50% or less with tight action and excellent bore. Thanks.