When researching serial numbers of Rockford pocket pocket watches using the "Red" Ehrhardt book you are limited to serial numbers below 824,000. Using the NAWCC chapter 149 database website provides model and grade information along with first and last serial numbers for a specific run. At the bottom of their table a note states 'Numbers above 824,000 - John Fogerty Research". I haven't be able to find a published list of Rockford serial number runs above the 824,000 number. Hope the Rockford experts can lend a hand.