That's yellow paint not thread. The painted stencil is correct for that time period.Embroidered USN on the collar, never seen that before. Are all B-G Inc. G-1s like that? Pretty special jacket.
Regards,
I'm nearly positive that your fine looking 55J14 B-G INC jacket was built with vegetable tanned hide. More over, with it's beautifully developed grain & above all wear that results in revealing nice undertones all lending to such a great looking appearance. Almost unheard by it's 1950 production date. Built at a time in which most all other USN type jacket makers had completely switched to building jackets using the more modern chrome tanning methods.
On the other hand & as evidenced with the last (to see my other two go here http://www.vintageleatherjackets.org/threads/m422-best-manufacturer.20885/page-8 ) of my three B-G jackets, not all 55J14 B-G INC jackets were built using vegetable tanned hides. That particular B-G INC jacket of mine and like all jackets made with chrome tanned hides it does not patina. Rather the pigment simply wears off. Thereafter revealing a run down looking denuded light brownish to an off white under coat. All what can eventually be expected to see with an every day modern well worn jacket built using chrome tanned hides.