[6pack] "Other" number on engine boss?

[Harold Morton]

List,  Looking closely at the engine serial number on the block's boss, I
noticed that there is a much smaller set of numbers stamped in it. It appears
to be an"11" over a "27", with a horizontal line in between. As if it were the
fraction eleven twenty-sevenths. This seems to have been stamped previous to
the engine serial number. That is, it seems to be "under" the serial number
stamping, and slightly distorted by it. Anybody know what this is? Jonmac? I
can't seem to find reference to this in the archives or with other web
searches. A date , maybe? Some kind of foundry casting code. Obviously, this
is not of great importance, but I will admit that the (only) thing I have in
common with cats is a sometimes potentially fatal curiosity. - Almost forgot,
car is a TR250, engine number CC46XX. (X's meaning I forget the last 2
digits.) Any enlightenment will be appreciated.  Hal Morton