https://www.ebay.co.uk/itm/Original-...53.m1438.l2649
There is something not quite right with this badge imo. The slider looks to be modern where as the badge has traces of the OTC title on it and the stipling may have been done with a hammer and punch. When the OTC converted to a JTC circa 1940 a
JTC version was produced so the erased scroll is odd but
could date from 1940 but that does not match the slider.
Either way £35 is a lot.