What was the angle of the sun to the subject? If the subject was in complete front lighting It should have have given a good exposure at 1/100th of a second at f16 or 1/125th at approx 11+3/4 stop. This would be contingent on receiving a full normal development and the film being properly rated by the manufacture FOR THAT AMOUNT OF DEVELOPMENT. As it was your favored exposure according to the meter were more pleasing to you. I am unfamilar with the meter in your camera and I am unable to suggest why it was 3/4 stop different. It is worth remembering that even a little underexposure causes a problem. 1/2 to 1 stop additional exposure more than the bare minimum may result in negatives much to your liking. Many photographers use film speeds, for roll film. that give 1/2 to 1 stop more exposure than the rated manufacturers speed and give 75-80% of the development that is recommended. It is very worthwhile to remember David Vestal's advice...Do not underexpose and do not over-develop.