CR are the date letters for 1984 but BR indicates that it is a European model which is probably not listed in the on line parts websites
I think you will find that the standard prop is 7½" x 7". Part number 319774 but quote the model number to your dealer to double check ( 6 and 6½" pitch props may also be available)
I think you will also find that it is left handed which has an unexpected effect if you try to use a RH one from another model. ... you go backwards!
The model number does indicate that it has an integral fuel tank (Models without an integral tank have "H" in the number)
Yes the fuel mix is 50:1
