The frame of course has the maker's name and address, along with a serial number starting with 'WW'. The left side of the slide is simply marked 'MODEL 1911-A1' in plain block letters, and the right side is marked 'SPRINGFIELD ARMORY' in identical fashion. From 1970 to 1976 the serial numbers had a prefix of '70G', from 1976 to 1980 they had a suffix of 'G70' which changed to a prefix of '70B' from 1980 until 1983 when production ceased. The major changes were a slightly heavier slide and a slotted collet barrel bushing. Colt introduced this model in 1970 as a newer version of the Model 1911A1. A serial number preceded by a 'NO' instead of a 'No' indicates manufacture by Remington-Rand. I found a site with a serial number range that this would fall in, but it mentions nothing about the prefix. A serial number preceded by an 'S' indicates an M1911A1 manufact- ured by Singer (not many of these around - an understatement) 3. The rampant colt moved from the left side rear mid 1918 to the position between the Patent legend and Colt address somewhere around serial number 293662. Colt duplicated the following serial number blocks: 60000 pistols in the Ithaca range 804 41696 pistols in the Remington Rand range 900 4171 pistols in the US&S range.
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