I picked up four razors this past weekend -- I'm confident about the correctness of the silver plated 1918 Ball-end Thin Cap, and the 57 Flare Tip Super Speed, but I want to go about cleaning the other two correctly (photos attached), I'd like to know if the pre-war Fat Handle Techs (triangle slots) were ever silver plated, or if they were all nickel plated. Finally, after doing a bit of searching on the net, the last razor has me stumped (photos attached). I'm not sure if it's a gold plated thick-cap old type head with a Contract-Tech handle, or if the handle is original to the razor, and if so, what was it marketed as (I've seen photos of the fluted handle on Contract Techs, and I've seen a photo of the thick cap head with that handle). The black finish is mostly off of the handle and the metal below appears either aluminum or a zamac/potmetal appearance. The gold wash appears to be mostly intact, and I'd like to keep it that way if it will hold up, but not adverse to going back to brass and maybe replate at a later date if it's worth it, but any suggestions on refurbishing the handle would make it show better (I use all of the razors I've acquired, no trailer queens allowed). Ideas if it's a Frankenrazor or stock? Apologies for the slew of questions, any and all information greatly appreciated.