Used but still plenty of life left, for sake here is a genuine Jaeger LeCoultre real alligator skin strap in black.
20mm at lug end and 18mm at buckle end. Beautiful high quality strap.
Came off a modern Reverso Day and Night but will fit any Jaeger LeCouktre watch with 20mm lug width spacing.
These straps costs £310 new from the Jaeger LeCoultre Boutique in Bond Street, London.
Grab yourself a bargain to finish off that JLC watch is quality style!