Standard GS78 guitar strap in thick black leather with a relic bronze-effect buckle. This strap is a second as it has been cut slightly shorter than standard. The buckle is also non-standard, but the strap is otherwise perfect.
Go to https://www.pinegroveleather.com/pages/bucklestraps for more info & pictures on this type of strap.
Tech spec:
Strap width: 60mm
Strap length: Long 40-57" (102-145"cm)
Weight: 350g (10oz) approx