A Colt 1877 Thunderer 41 Long colt revolver. Maunfactured in 1878 in the second year of production. The top of the barrel s marked with the two-line address. The left side had the etched pannel marked 'COLE D.A. 41'. The left side further has the three line, three patent dates. And the upper left of the tirggger guard is marked '.41 Cal.' All nickle finish with blue trigger, hammer (with polished sides).