Are you looking for a Kelly retourne .
I do think that box calf Kelly retourne is v rare ! If keen for smooth leather only seems like more common option would be swift .
Epsom and togo are popular cox they r easier to maintain And they are the cheaper option first hand + prices do well in the second hand market . That’s why they are so popular in sg. But I personally find that epsom bags doesn’t feel Lux -felt the same as Kate spade/ Michael kor bags that’s why I lost interest in epsom after awhile .
Swift is soft and buttery and nice to touch . Many pink bags are in swift as this leather takes colour best . Esp pink. But If you aren’t careful when you store your bags , the bag might lose its shape. I once left a bag insert inside my birkin 25 and left it there for awhile, it started to develop a line at the back . Hence price wise , it doesn’t do as well in second market . You can get swift Birkins and Kelly at a pretty gd price in the second hand market .
But I would only get swift leather bags in small sizes like b25/k25
Evercolour is a great option but I see it mainly in Constance bags not in B/ K. Evercolour is nice to touch , doesn’t lose its shape as easily as swift . its fairly scratch resistant ( read that it’s fairly water resistant too!).