I have a 25hp Mercury 2 stroke engine serial number OD191822. The prop that is currently installed needs to be replaced but local shops can't seem to cross the numbers on the prop. The number stamped on the outside housing of the prop is 1964OA4OP13. Inside the prop on the shaft housing is stamped JMD10.38X13P. Can anyone identify the year based on the numbers provided above and shed some insight and or guidance on how I can ensure I can order a replacement prop. Any assistance is greatly appreciated.