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Don't know if these will help in your mission, but found some photos by googling.
Best Wishes in your restoration.
My grandson works for a car restorer, they'd love to see that.
Dear Mr. Spillner,
Thank you for posting your inquiry on History Hub!
We searched the National Archives Catalog for any photographs of “Mercedes” that might be of interest to you and located 3 digitized items in the National Archives Collection of Foreign Records Seized (Record Group 242). The photographs can be viewed here, here, and here. For more information regarding possibly locating photographs of interest to you, please contact NARA's Still Picture Branch (RDSS) via email at firstname.lastname@example.org.
Please note that due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from RDSS. We apologize for this inconvenience and appreciate your understanding and patience.
We hope this information is helpful. Best of luck with your research!