Following the popularity of the Colt Python, the Anaconda was primarily chambered in .44 Magnum. However, they were also available in .45 Long Colt. The one in the photo is quite possibly the rarest Anaconda version; the 4” barreled version in .45 LC. Exact number made is unclear since they were such a short production run; although Colt does keep records, you have to pay a fee to have them look up the information from their archives. Probable value on a 4” Anaconda in .45 LC would be around $3,500 - $4,000+.