Having difficulty figure, n this out, believe it, s a double threaded,(can, t thread standard pin right threw) doesn, t have the same characteristics as others i have, to me it more of the threadless 743.2 style with same dim..it, s yellow green/with amber swirl.n, more of a rounded dome, smooth base and {MLOD}...would some of the old 143,s ie unembossed montreal, s be difficult to thread on pins,,or could this be the threaded verison (067) Thanks for the assistance every one, come to the conclusion from Canada, s renoun expert that it, s possibly a 050 with distorted threads old canadian piece Thanks R.P