Birkenstock don't oil their "oiled leather" properly. I grew up oiling horseriding saddleware and Birkenstock's "oiled leather" is dry & hard, not supple & soft. I do it myself. These are "Franca"
Womens And Mens Birkenstock Arizona Habana Oiled Leather - Happyfeet.Com
Birkenstock Boston Oiled Leather Clog | Black | Narrow Fit - Birkenstock Hahndorf
Montana(Oiled leather) / Black | BIRKENSTOCK(ビルケンシュトック ) 通販 正規取扱店 シューズ