Don't obsess about the finish on a carry gun. Yes, we all want to be careful and maintain them as well as possible to protect our investment and so they look nice, but wear is inevitable. The older Model #37's, #38's and #42's are great, but parts are more scarce every year. Buy a current 442 or 642 and enjoy it. When the finish wears send it to Robar in Phoenix (Firearm Finishes, Custom Weapons, Gunsmithing | Robar), and get it refinished in electroless nickel or Roguard and get the internals NP3 treated. It will have a better than factory finish and have a slick action to boot. After that it is unlikely that you will ever need it refinished again. If it does Robar offers a lifetime warranty on Roguard and NP3.

Best Regards,
ADP3