* .32 caliber: The Colt Model 1877 was chambered in .32 caliber, making it a likely candidate.
* "Horse" on the side: The Colt Model 1877 featured a distinctive "Colt's Patent Fire Arms Mfg. Co." inscription, which often includes an image of a rearing horse.
* "MARCA REGISTRADA" on the side: This Spanish phrase translates to "Registered Trademark" and was commonly used by Colt to indicate their trademark on firearms marketed in Latin America.
However, it's important to note that:
* Other manufacturers: There were other companies that produced .32 caliber revolvers during that era, so it's possible the revolver you're thinking of was made by a different manufacturer.
* Variations: Colt Model 1877 revolvers came in various configurations, and not all of them had the "horse" image or "MARCA REGISTRADA" inscription.
To determine the exact manufacturer and model, it's crucial to have a clear image or description of the revolver in question.
If you can provide more details, such as:
* A photo of the revolver
* Any other markings or inscriptions
* The overall size and shape
I can help you identify the specific manufacturer and model.