Finnish Army surplus general purpose leather equipment strap. These straps were issued for attaching items to their breadbag, backpack, or to any other purpose you would like. You could never have enough of these. Or that is my experience anyways.
These are roughly 50 cm long and 1.6 cm wide green-grey leather straps with a nickelled roller buckle. These have been manufactured post war but are identical to the period issue straps.
Price is for one.