Good news and bad news. The good news is you found the symbols I sent you looking for. The bad news is I have never seen any listing for a symbol "F". Is there any chance there is a letter "A" in front of the "F"? If so, symbol AF is correct for a 504 with a gasoline engine. It was also on other C-153 engines (in 203 combine for example). If you find an "A" in front, there is your answer. If not, you can dig a little deeper. If you tear it apart, below the points plate are the centrifugal advance weights. They are mounted on a disk on the distributor shaft. That disk will be stamped for maximum advance and rotation direction. The AF distributor should be stamped 21L. If it is stamped something else, we can do some more looking to narrow down the possible distributor version.
The "E1" appears to be a date code, for May of some year that ends with a "1". 1961 would make sense for a 504 tractor.
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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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