Curator Response: Thanks for the report and images. After a brief study, I believe your barrel bridge (with serial number) has been swapped from another movement. During this period, the "Riverside" Model 1908 movements were typically marked "5 Positions" on the barrel bridge and featured a special finish on the winding wheels. The barrel bridge damaskeening pattern and winding wheels on your movement is more consistent with the Grade No. 610 classification, matching factory records. You can confirm this by checking for the partial serial numbers under the other plates to see if they match the primary serial number. Hope this helps.