Hello, if you put your serial number in this link -> [link|https://mybusinessservice.surface.com/en-US/CheckWarranty/CheckWarranty|Check Warranty Page - ROBO SelfServe Portal (surface.com)|new_window=true]
It should come back with the exact model.
To find your serial number you can use this microsoft guide -> https://support.microsoft.com/en-us/help/4036293/surface-find-the-serial-number-on-surface