I have a set 2 straps to trade from a button box that I recently acquired. The straps are in as-new condition. Sadly for me they are a bit too short so if you have a set that's a bit too long for you I hope we could trade!
The straps have nice padded leather shoulders. They measure 35 1/2 inches at maximum setting and 27 inches at the minimum setting. There is also a matching back strap (that I haven't used).
Please PM me if you have a set to trade.