For sale is a lightly worn Hirsch Robby strap with black Italian calfskin on top and red rubber on the underside. I've wiped down the strap and it looks nearly brand new. These typically retail for $82.95 direct from Hirsch.
The Hirsch Robby Sailcloth Effect is made of 2 layers:
Top Layer: perforated Italian calfskin
Bottom Layer: Premium Caoutchouc (natural rubber)
Price: $45 which includes shipping in the CONUS.
I don't have much feedback as a buyer/seller, but here is a recent transaction where I sold a watch elsewhere: https://www.watchuseek.com/threads/exce ... t-52181995