Cimarron carries both Pre-War and Old Model guns from both Pietta and Uberti. The Pietta models will start with PP (PP513), and the Ubertis are MP (Model P, i.e. MP513). Both have the two line patent date. The MP Old Model will have the original style v-notch rear and tapered front. I think the Pietta Old Model has the same square sights as the Pre-War. The Pietta is not available in charcoal blue, while the MP is but may not always be in stock.
As for the generic Uberti Cattleman, I believe it is available in both Pre-War and Old Model. It is the same basic gun as the Cimarron but a little less refined, such as having the safety hammer and more proof marks on the frame and cylinder.