Wheel date of manufacture - 14" Cromodora

Hi,
Can someone help me identify the month of manufacture for my 14" Cromodora wheels. Below is the type of stamp on the inside, so year 1979 in this case. But I didn't know how the month box works. Is this wheel made in February (months go down column) or March (months go across rows)? All my wheels have this same style of stamp on the inside. I can see no other inside stampings.

On my 76 GT4, I seem to have a collection of years from 77, 78 and 79 for my four wheels, so not original. I'm trying to decide whether to do the 16" wheels from Superperformance with more tire selection. I'm thinking of trying to sell the 14" rims to help fund the 16". Or should I keep the 14" even if they go on the shelf? I figure a future owner could just buy their own 14" if they ever wanted to go back. Can't think they would.

Also, is there a source for the smaller spare that would have originally come with the car? Specifically a 16" if I go that route.

Thanks!
Russell
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