Samsung watch 4 Hybrid leather band is really nice, link in comment : r/ GalaxyWatch
Samsung Watch Band, Strap for Samsung Watch 6 Classic 43mm, Galaxy Watch 6 Band 44mm 40mm, Galaxy Watch Strap 5, 4, Leather Band for Samsung - Etsy
For Samsung Galaxy Watch 4 5 Pro 6 40/44/45/42/46mm Genuine Leather Band Strap
Upgraded the band on my Galaxy Watch 4 Classic to the Hybrid Leather. Big improvement from the stock band, I really love how it looks with the stainless steel. : r/WearOS
Wearlizer Leather Strap Compatible with Samsung Galaxy Watch 6/5/4 40mm 44mm/Watch 5 Pro