Oregon 203SFHD025 Bar 20 inch for SOME Stihl .063" (1.6mm) 3/8", 72 Drive Links
11 tooth end sprocket. In particular the bar mounting end, oiler hole etc. This is a D025 mount. No chain is supplied with this, needs 1.6mm gauge (NOT 1.5mm etc). Had a couple of these so maybe not exact one in photos.