It is the New Model Pocket revolver "conversion." The New Model Police is an entirely different and larger gun and has a trigger guard. The original Pocket Model was a percussion revolver of .31 caliber; the conversion took .32 rimfire.
After rimfire cartridges came into general use, Remington offered the revolver in .32 rimfire with a removable rear cylinder plate (so as not to infringe the Rollin White patent). Those guns were made that way at the factory; they are often called "conversions" but whether the cylinders used were actually percussion cylinders or were new made is in question.
In any case, the gun in the picture appears to be factory made, not a conversion by a gunsmith. The rear plate is normally a bit loose as it is removed for loading.
Loading entails removing the cylinder, then removing the rear plate, loading cartridges into the cylinder, then replacing the rear plate and putting the cylinder back in the gun.
Jim
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