Trinol Anastigmat 105mm F3.5 Lens Made in Great Britain on Sony A7Rlll

 Trinol Anastigmat  105mm F3.5   M42 Mount

MADE BY NATIONAL OPTIC.CO.Ltd.  Leicester,ENGLAND. (Daughter company of Taylor ,Taylor & Hobson)

Most this lens are in Leica  M39 screw mount or Contaax mount  made by Stewartry of Scotland. M42 mount is very rare.