Pete, I recently received an email from Pat Williams, who spent years documenting simplex frame and engine numbers. He gave me some info, which I will post below. From this info, I would say you have a 1954. I'm trying to get more info from him, and if successful, I will post it.
Frame #08195 is a military model with government documentation of production as a 1954 model.
Frame #08284 is your frame
Frame # 08815 is an Anniversary Model (which was 1955).
If we slot your frame in there, it looks like yours was built within a couple of weeks of mine!