Hi
The jacket looks cool and vintage however , it’s not a G-1 jacket . This is a commercially made for the public jacket that looks to be a 1960s or early 70s manufacture. This is only my opinion ( about the date not the fact that it’s not a G-1) . So you have a nice vintage commercially made jacket that will look good when reconditioned a bit. Enjoy it.
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I’ll try and get some more photos up soon thanks for the infoa pic of the zipper puller and starter box would help to date the jacket. small tooth contras were used from the 1940s-later 50s. a pic of what's left of the label would help as well.