102/1 Celestion cone

Hi fellas just going to throw a curly one at y'all.
I've seen recently an old Celestion recone(of a late '60s alnico T1088) with a cone that has the white stamp number 102/1.
Now I know that from '71-'73 the Pulsonic cone Celestions had a 102/3 stamp(and others also) but haven't come across this 102/1..........what is it is the question.
I've emailed Brian at Bygone Tones about it and he's as baffled by this as I am.
Any info would be gratefully received.

My first thought was “102/14” with the “4” somehow not completed by the stamping. That would also be of ca. 1972 vintage.

For example I’ve seen cones that look to be stamped “177:” where that seems to be the case.

Thanks Jeff.........yes, the old missing numeral trick...........a definite cause for confusion.