some of the other spaniel breeds from that period do look similar but isn't he a handsom chappie there are sadly no details on who the dog is which is a pity.
More breed history you didn't care about
Up until the 1800s, all the spaniel breeds; springers, cockers, fields, sussex, (not sure about clumbers) were one and the same. The larger ones were called springers, for springing game, the smaller ones were called cockers, for going into dense brush where the larger dogs couldn't go, after woodcock.
Eventually people started breeding more specifically for certain traits so they evolved as separate breeds. That is why they still can look so similar, and the old photos can make it hard to distinguish what breed you are looking at sometimes.