It's extremely similar to Joe's 1963 engine in a 1964 Alroh Imp, with what appears to be the same engine. See this thread:
https://www.outdoorking-forum.com.au/forum/u...amp;Main=4393&Number=15550#Post15550 Joe's engine is a Briggs 60102 made in April 1963. That seems to have been when the Imp was in its very early production phase, so there may have been changes from one edger to another. The one in this thread looks as if the edger frame may have been painted silver to match the engine, before they started painting them Alroh's hammertone green. If so it may have an even lower serial number than Joe's.
If you look at the edger's serial number, you may find it contains the last two digits of the year it was manufactured - see the other thread.
Please post the Model, Type and Code, which are stamped on the vertical surface of the engine's cooling air cowl, near the intake port. If you also post the edger's full serial number, we should be able to put it into context with Joe's similar edger.