Seeking Information on circa 1939 era 'Durham Special Constabulary' Badge[s]

[dpast32]

Hello Gentleman, I'm attempting to learn, or at least estimate the approximate age, date of use / issue of a particular U.K. WW2 Era 'Special Constabulary' Cap Badge, as would shave been worn by an 1939+ Member of the Durham Special Constabulary. [ And or any such Badge, even if it's not the Cap, or Hat type ] As I'm sure most here are aware, the subject not British Military Badges can be most confusing, sometimes even for the dedicated collectors. I personally haven't collected these items since my High School days, & that I'm afraid was man years ago ! I'm seeking to determine WHICH TYPE / STYLE of Badge would be proper / correct for wear by a 1939 / WW2 Special Constable on the Durham Constabulary ? I am aware that most Badges were produced in both Brass color, or Silver, 'Stay-Bright' [ or Stay-Brite ], but I'm not at all certain as to which type / color Badge would have been worn ? And, to confuse the issue even more, there's also the 2 methods of affixing the device, by button / tab, or by the slider type ? I between advised that the method of attaching pretty much depended upon the choice of the wearer ? I've also been advised that the Badge color may also have been dependent upon the quality of the Badge, but that can also be quite confusing too ? If anyone has any information which may assist me with this, I will DEEPLY APPRECIATE hearing from them. I will be interested in ANY relevant information, even if it appears somewhat trivial. THANK YOU

Best regards, Dom Pastore Jr. / dpast32@aol.com