It's not worth that much. It's an arsenal rework with an AJ Savage replacement slide and they aren't all that rare. AJ Savage received a contract to produce M1911 pistols during WWI but never delivered a completed one. The war ended and all contracts were cancelled. Savage complained and eventually the goverment bought the slides the company produced. Some ended up in the civilian market as surplus but quite a few went into reworks. AJ Savage went out of business around 1920 or so. This not the same company that is located in New York, they were in California but it was the same person and I think his son was involved as well. I have an M1911 in the 500000 range that has a Savage replacement slide and I would be very happy to find somene who would pay me $2500 for it.