This is a IWC style Clasp,Sourced by Strapmeister .
1-Brushed & Polish stainless steel clasp.
2-Gold plated steel clasp
3-Rose Gold plated steel clasp
All 3 clasp is Not stamped & suitable for IWC straps & other watch straps with similar strap size/width
Its Available in 1 size which is 18mm Strap width . Price is for the Clasp only .Shipping is free to most places.