So I've reluctantly joined the camp that surmises that there was a separate set of numbers, or at the very least, a very abstruse numbering system for some full grands. Nor do they appear to be in a year/model, or vice versa, format. On the few I've seen, the number doesn't make sense as the trailing digits of a 1xx,xxx number with the first one or two numbers suppressed. Unlike the ever-misleading case number, this number appears in exactly the size and spot that a serial number should. in the hundred thousands) with only a 4- or 5-digit number. I have seen full grands made well after 1900 (whose serial number should be six digits, i.e. I have always been under the impression that Chickering had a separate set of serial numbers for concert grands.
