Just checked my own notes/drawings and your Chubb (pictured with door open) looks same as the 'Standard ABP', but the one I saw had a chrome backplate under the handle and keyhole escutcheon. Door was 1.75 inch outer protective slab, and the boltcase housing the mechanism and back pan another 4.75 inches, so door was 6.5 inches thick overall.

Some Stratfords can be a pain to ID and date, as mentioned here:
https://www.antique-locks.com/showth...light=Sterling