49cc Honda push rod engine unusual serial number

#1
h2.JPG Hi,
I am new to the forum so thanks in advance for accepting me. I mainly collect and tinker with old cars now as my health has taken a turn and my wife tells me I am too old to ride anymore. I am building a small bike for my grandson and I picked up this Honda engine that I can not find information about the serial number. E36-0004. It is a mint condition early push rod engine I assume between 1958 and 1962 but the serial number stumps me. Any information would be of interest to us both.
Thanks for your time. h1.JPG
 

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