I once saw an Aero USN jacket that had spots of wear where the seal dyehad worn a little to show a red, russett underneath. It was subtle, not the 'tea core' look, but very nice indeed.
Aero's goat is very nice indeed. More substantial than that I've handled from other companies, but still much lighter than steer or horse - a nice compromise for a lighter hide that you can still wear in anger without worrying overly about damage.
It is nice indeed. I tried on a halfbelt in Vicenza when I visited the factory a few years ago. Obviously my experience is subject to the inevitable variations between batches that happen with anything organic, but fwiw I found it a nice hide. Similar thickness to CXL FQHH, which surprised me, but definitely 'lighter' to wear as new. It reminded me a bit of the lighter steer (not CXL) from which my Highwayman is made. Same thickness asthe heavy stuff, but a sense of wearing lighter, morep liable andwith more drape right from the off. I think it would be a great hide for something that isn't so close-fitting to the body - 42 A2 contracts, the HWM, and so on, where a softer drape improves the look, especially if you want that from the off rather than needing to wait for it to full break in naturally.
Can't comment on the break-in period as I've yet to own a Vicenza jacket, but I've certainly not been put off by my limited experience of it. The Shinki I've handled was a bit too light and shiny for my tastes, but again that was a] new and b] a very specific batch. I've not been inclined to go looking for a shinki hide jacket elsewhere. (Aero tried some of their hides about ten years ago as I recall, but chose not to taken them on to their regular line. As memory serves it was not out of any concern about quality, but simply that Shinki were'nt able to guarantee the sort of quantity of hides that Aero wouldhavewanted to make it a standard offering.
I think that this might happen if the 'pale' undertone (which looks a bit like the undertone of seal jerky HH) gets darkened sufficiently on mine; it is my only Aero that looks more or less new apart from creasing. It's nice to have the contrast, though. I didn't get an outer chest pocket on it and have seen quite a few 1930s and 50s HBs that don't have one, either (I can almost get away with it as a smarter jacket). Overall, it's my most 'climate-flexible' Aero.