here is a link where they show the difference cimarron-firearms.com/products/revolvers/single-actions/old-model-pre-war-frame-comparison.html

Howdy Larry, - the differences in the Old Model and Pre-War versions of the Model P are : The Old Model is how Colt made the guns up until the mid 1890's. It uses a setscrew in the front of the frame to secure the cylinder pin, and the head on the ejector is round, called a bullseye ejector. Some folks call this the black powder frame (although in modern reproductions, smokeless powder is fine). The Pre-War version is how Colt made the 1st Generation SAA from mid-1890's until World War 2 This frame uses a spring-loaded transverse push-button to secure the cylinder pin, and the ejector head is a crescent shape. Also, current Pre-War models from Cimarron have a medallion on the wood grips, and the Old Model guns have no medallions. Otherwise the guns are identical. Sights are identical, with a v-shaped rear and tapered front. They both have coil hand spring. (( Cimmaron's picture differences here )) : cimarron-firearms.com/products/revolvers/single-actions/old-model-pre-war-frame-comparison.html

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Hi Larry, the differences in the Old Model and Pre-War versions of the Model P are : The Old Model is how Colt made the guns up until the mid 1890's. It uses a setscrew in the front of the frame to secure the cylinder pin, and the head on the ejector is round, called a bullseye ejector. Some folks call this the black powder frame (although in modern reproductions, smokeless powder is fine). The Pre-War version is how Colt made the 1st Generation SAA from mid-1890's until World War 2 This frame uses a spring-loaded transverse push-button to secure the cylinder pin, and the ejector head is a crescent shape. Also, current Pre-War models from Cimarron have a medallion on the wood grips, and the Old Model guns have no medallions. Otherwise the guns are identical. Sights are identical, with a v-shaped rear and tapered front. They both have coil hand spring. (( Cimmaron's picture differences here )) : cimarron-firearms.com/products/revolvers/single-actions/old-model-pre-war-frame-comparison.html Here is a link where they show the difference cimarron-firearms.com/products/revolvers/single-actions/old-model-pre-war-frame-comparison.html