how were engine numbers stamped?

["Watry, Andrew (LNG-SFR)" <Andrew.Watry@domain.elided>]

Anyone know how the engine numbers stamped on the 101-115 blocks were put
on?  Was it done by hand, or with some kind of progressive numbering device
like a giant Bates counter?  And did the process change when the numbers
moved (at the end of the 1750 run?) from behind the distributor on the
raised boss, to the exhaust-side rear block flange that attaches to the
bellhousing?  Is that why the location changed?

I've been looking at a lot of block numbers in furtherance of complete
Berlina Register records and got to thinking about this.

Andrew  Watry
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