This information is from Roger Moore's old web site. 1950s G-1 Jackets As noted above the first G-1 spec was the 55J14 which was manufactured from 1947 to 1961. These jackets very collectible and only slightly less desireable than the earlier M-422A jackets. The 55J14 typically have shorter bodies than the M-422A and many have a snugger fit for their stated size. All of these jackets retain the painted "USN" stencil under the mouton collar. G-1, Spec 55J14 In 1951 or thereabouts the MIL spec jackets were introduced starting with the MIL-J-7823(AER). All of the jackets in the 1950s, save the 1951 55J14, had this specification. As with the earlier jackets the manaufacturers apparently were given much leeway in the cut and sizing of these jackets. It is interesting to note that even among the same contrcat and manufacturer there was often large differences in sizing so if you buy one of these to wear...make sure you check the measurements! G-1, MIL-J-7823(Aer) 1960s G-1 Jackets In 1961 the A (MIL-J-7823A) series jacket was introduced and only two manufacturers had contracts: Ralph Edwards Sportswear and Irvin B. Foster. The A series is the scarcest of 7823 series and are noted for having awesome goatskin and collars that fade to a nice honey rust color. G-1, MIL-J-7823A In late 1961 the B series was introduced and lasted until the end of 1963. The 1961 B series is probably one of the hardest 7823 jackets to find. I am fortunate to have a great original example! G-1, MIL-J-7823B In 1964 the C series (7823C) was introduced and lasted until the end of 1967. These are often considered by collectors to be the last of the "good" jackets as they are the last to universally have the motoun collar. In addition, the early C series jackets used the traditional single ply rib rack waistband but some of the laters Cs and all of the Ds and Es use the inferior folded over two ply waistband. G-1, MIL-J-7823C In 1968 the D series was introduced and many (but not all had a fake fur collar instead of the mouton used in all of the earlier jackets. The jackets were still goatskin but are very common and therefore not all that collectible. Although they do make great everyday wearers, I have only included one for reference G-1, MIL-J-7823D In 1971 or 72 the E series was introduced and persists until today. The spec was opened up to allow the use of cowhide (vs. the goatskin of all of the earlier jackets). As a result, while these make great wearers they are not collectible and I do not have any on this web site.