I scanned this picture of a badge I have, I remember Wilf Wetton the superintendant at Chesterfield giving it to me when I was about 8 and my dad soldering a pin on the back for me, as its actually a watch chain fob. Notts and Derbyshire collieries rescue, and the picture is of an old style Drager or MECO type helmet.
To me, priceless

Brian