I think the first two are both 1966 pea coats, but not having a close look at the tag, it is hard to tell. Really makes no difference, though. The third one is a Pembroke 1972. It appears to have the least wear of the three. The wool in all three should be the thick Kersey wool. I think I would go for the one with the least wear, unless price were a real consideration.
Don't ever believe the chest measurements as provided. They are only giving what appears on the tag, with maybe a cursory measurement. The length measurement may be accurate. Ask Gary for an actual p2p on the one you like the most, using my instructions for taking the measurement. Also ask him to hold the coat at an angle to a strong single light source, such as a daytime window, and inspect carefully for damage. Using this method every imperfection will be visible, even those not visible when the coat is being worn. It is the odd used peacoat that won't show several small imperfections when examined this way. I have one that is absolutely imperfection free when being worn. When held up to the light, a small imperfection in the back appears that would never be noticeable unless closely examined in this manner.
Clarinet Player makes some good points about the length, that you might want to consider. I have found, however, that length in the body is seldom a concern if the chest is a good fit. Also, if the sleeves are too short, they can usually be let out, or taken in if too long.