mopar jacks

[Lemon twist Cuda]

I asked someone on ebay if they had a date coded 73 mopar jack. They said they have a 3C, 3F and a 3G. What do the letters mean. Thanks

 

[340challconvert]

I think the 3 is for 1973. The months go in alpha sequence
A= January, B= Feburary and so on.
3C should be March 1973
3F June 1973
3G July 1973
Numbers should be on the rivet on the jack head

 

[Lemon twist Cuda]

Thanks