A 45mm watch well under RRP from TW Steel. A quick check found this to be the cheapest around for these.
Information direct from TW Steel product page:
• 45mm diameter
• 316L steel
• Sapphire crystal
• Screwed crown
• Miyota 1S13 quartz
• 50m water resistance
• NATO strap
Currently six colour combinations at this price:
https://www.watchdepot.com.au/collections/brands-tw-steel
The Watch Report review of a steel bracelet variant. Case thickness said to be 8.5mm in this video.
That info not disclosed at Watch Depot or TW Steel page.
TW1301 silver case/white dial review. Closest variant of the TW1323 in main deal link.
Watch Depot Cyber Monday page
https://www.watchdepot.com.au/collections/sale-cyber-monday-…
Damn. Thought slim line meant a smaller watch face