The new (old) watch is a GMT 1675 from the late 60s. I have been lusting after this watch for a number of years, certainly in part because of all the pictures I saw in this thread. About 9 months ago, I came upon an intriguing example of a 1675 on Instagram via analog/shift. After a number of forum members vouched for a/s, i visited James (the founder/CEO) at his office in NY. For anyone that is interested in vintage watches, I would definitely recommend spending time with James, he is a cool guy and enjoys sitting around and talking about watches, never with any hint of a hard sell. Ultimately, I passed on the 1675 I had inquired about because frankly, it just looked too old. This is definitely part of my conflict with vintage watches - I like them in theory and enjoy the aesthetics of older eras but cant really get behind anything with a ton of patina or use.
A few weeks ago I decided to reach back out to James after seeing a picture of a 16750 he had posted. This one looked promising - a newer model meant fewer of the wear issues I was concerned with. However, when I looked over the watch and compared it to a 1675 that happened to be in the office I quickly realized it didnt speak to me. I much prefer the matte dial of the 1675 vs. the glossy dial on the 16750. The 1675 that I had stumbled upon though seemed to check my boxes - it was in great shape and really spoke to me when I tried it on a strap. I think the strap adds a bit more of a casual air that appeals to me vs. a bracelet.
It turns out that the 1675 in question had its dial replaced at some point in the 70s. I believe James knew this from the lume plots / tritium aging. This explained why in part it was in such good shape for a watch of its age. After some debate, I decided that as long as the dial was period correct (which it was), I was comfortable with it not being original. My biggest hang-up was the impact a replacement dial would have on resale value. Ultimately, I will cross that bridge when I get to it. The positive is that I can now watch the vintage process unfold under my ownership vs. inheriting someone else's experience.
Anyways, long ramble that I am sure no one will read. The summary is that I found a watch that I love and a dealer that I recommend highly.