I got this 1911 Navy yesterday and I'm tickled! It was shipped August 8, 1913 to Brooklyn Navy Yard. It appears to be authentic and all there with the exception of the magazine and the early checkered, arched mainspring housing. I can find a flat MSH but it makes me wonder why only the MSH was changed. I'm guessing someone may have simply preferred the arched MSH when they showed up in 1924.... or not. Sam Lisker once told me he likes to leave the pistol the way he found it.