With both Roleicords and Roleiflex models, at least up to the 1950's, which is as far as I go, no click stops, with Rolleicords up to the 4 shutter speed are found on the right of the lens panel and F stops on the right side, later than 4, the 5 a and b they used the RV method, you will find the EV on the right side of the lens panel and the shutter speeds and stops on the left are you sure about the serial number, My 5a 1923712 and the last model Rolleicord, the Vb, only goes to around 2677534, so the serial number you quote is way to high, as far as the emblem on the focusing hood, they did not all have it, early models certainly did not, and I have a Rolleiflex Automat from the 50's that does not have an emblem on the hood, The serial number on Rolleis is just below the Rolleicord name in the middle,
Richard