It’s always hard to find a good leather strap at a affordable price for your vintage pieces. 
Here are some nice handmade calfskin leather straps for you to choose. Why calfskin? Calfskin offer a perfect combination of style, comfort and durability, and the most important part is that it really affordable.
These straps are all handmade in Vietnam.
(NOTE: Patina Noir’s stitch is not white, it is patina)