For those who are following this study, two more questions have been added to the bottom of the Edison A-250 questionnaire: 18) Cabinet finish (may add more specifics later): Red mahogany: Serial #1429 Dark mahogany: Serial #13417 Oak: Serial: #11187 19) Number of mainsprings (Frow indicates earliest production may have had single-spring motors). Spring barrels are visible if you remove the grille and peer into the motor compartment by looking in the upper r.h. corner. A flashlight helps. The spring closest to the winding crank will be more visible. One: Two: Serial #1429, 5751, 11187, 12033. I'll continue to update the list as I obtain more data. For those who may be interested in following this study, please let me know if you would like to have me post updates to this list as I add each additional machine, or have me post updates with each two or three machines added (if we should be so fortunate), or if you prefer to contact me instead. Now that I have the list formatted, it's convenient to include additional entries and post the updates. Best regards, Andy