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Jap Identification

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I have recently started to renovate a Jap engine and looking at various web sites I cannot find one to date the engine accurately .

The engine No is RC 30771 stamped on the crankcase , there is also another No which is difficult to see but is either WS 8623 or WS8528


The barrel has the No H 11238


The flywheels do have the No 1950 on them but unsure if this is a year No .


Any help in this regard would be appreciated .

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