Numbers game....
Hi Gary
The raised casted numbers are just that ....casting numbers ....not necessarily unique to one engine but a batch or model series.....
The other two are stamped at a later date and are UNIQUE as serial numbers to that block and can be traced to actual assembly date/place if they have a suffix/prefix.
Bob
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Bob Carriere....B.T.B
C15a Cab 11
Hammond, Ontario
Canada
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