Ok so I'm going to list off some must have specs and then some preferred. I'm looking for something rather specific and I honestly can't find anything that covers all the features I'm hoping for.
Must haves:
40-44mm case dia, max of 49mm lug-lug, sapphire glass, min of 100m wr, screw down crown, crown guards, field or aviator in style, stainless bracelet (or reasonable lugs that allow for strap changes), automatic movement.
Preferred features:
Good lume, calendar complication, railroad style minute ring, compass bezel, inner rotating bezel, Swiss movement, bonus to Rose or bronze.
No gold pls.
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Classic 98B326. Seem like a Bulova guy😉
I’d have a look at Boldr. I just bought one of their Venture field medics, which are too small for you but take a look at the expedition line.
It’s got all your must haves, doesn’t come with a bracelet but the 20mm lug width means you can easily change the strap out. They do bronze divers as alternatives, Japanese movement instead of Swiss but otherwise I think it ticks most of your boxes. Otherwise I’d look at Hamilton.
Huh...not quite what you're looking for, sorry🤒
Much better
I would suggest the Islander #ISL-53 or #ISL-54. It has most of the specs you listed, minus the crown guards and railroad minute track, and can be had for $260 with the bracelet. The #ISL-53 is the model with the calendar.
#ISL-53 on #BRAC-11 bracelet
40mm diameter, 47.5mm lug to lug, anti-reflective coated sapphire crystal, screw down crown, 100M WR, NH35 movement, C3 SuperLuminova, comes on a strap but the bracelet is fitted to this case. The watch is $199 ad the bracelet is $59.
Mission accomplished. I think the Glycine Airman SST may have literally almost everything you asked for:
https://www.ashford.com/glycine-gl0313.html
✅ 40-44mm case diameter – 43mm
✅ max of 49mm lug-lug – 46mm
✅ sapphire glass – yes
✅ min of 100m wr – 200 meters
✅ screw down crown – yes
✅ crown guards – recessed into case
✅ field or aviator in style – aviator
✅ stainless bracelet (or reasonable lugs that allow for strap changes) – yes
✅ automatic movement – yes
✅ good lume – C1 Superluminova
✅ calendar complication – yes
✅ railroad style minute ring – I think that qualifies
❌compass bezel – no, but world timer
✅ inner rotating bezel – yes
✅ Swiss movement – yes
✅ bonus to Rose or bronze – rose accents
Other color options:
https://www.ashford.com/glycine-gl0314.html
https://us.gnomonwatches.com/collections/glycine/products/airman-sst-black-ref-gl0311
https://us.gnomonwatches.com/collections/glycine/products/airman-sst-blue-ref-gl0310
https://us.gnomonwatches.com/collections/glycine/products/airman-sst-pumpkin-black-ref-gl0309
Raven Airfield? There is a date version as well and you can pick between white, black, and green dials
https://ravenwatches.com/collections/all-watches/products/airfield-deposit-white-no-date
Not mentioned enough on WC but great watches
Hamilton Converter
Has a few color and complication options.
https://www.gnomonwatches.com/products/khaki-aviation-converter-auto-black-bracelet-ref-h76615130