hi - welomce to the GMB.
I'm almost certain this isn't Peachblow, and you're probably correct with your description of diamond quilting on a cased white interior - in the U.K. we tend to call these 'diamond pattern satin air trap' - a decorative technique that had its origins somewhere around the 1880's.
I doubt that these were marked - at least in the sense that they were backstamped - so finding a maker is probably a non-starter - I believe that B. & S. were another maker on your side of the pond - in addition to Mt. Washington. Probably several makers in the U.K., including T/Webb. The books seem to suggest this was also made on the Continent of Europe - the Truitt's associate Weltz with this decorative feature, but no idea of other names.
As a type of glass, this was produced on both sides of the pond and in a variety of colours and shapes - the most attractive, possibly, being the Mt. Washington 'Rainbow Mother of Pearl' (on the base of which sometimes the word Patent is seen), and this is typified by a variety of colours, so best to avoid calling yours by this name. The surface texture also apparently varied, and there are a variety of 'patterns', the best known of which is possibly herringbone. The outside colour often shades downwards, but not always - many have simply a uniform colour throughout (on the outside).
Assume your description of 'camphor handles' is the equivalent of saying satinized??
Yours is a fairly classical shape with the ruffled rim etc., and I'd assume original, but whether this decorative feature has been copied subsequent to the C19 I've no idea. We have folk here who collect this type of glass and might possibly have a better idea of origin than me.
