I've got a very pretty pair, checkered targets, football cut, black washers, there's a chip out of the rt. panel half right behind the trigger guard. $55 shipped, can send pictures if you're interested. [email protected]
This 2.5" one is NIB, book says 1993 manf., doesn't say how many were made in .357 cal., does say that 158 (2.5" ones) were made in .38 spec. cal. for export to Brazil, appears to me darn few were made in .357 cal.
Latest book shows 1973 for your 66. Get you some colored electrical tape to stick on your sites when practicing on occasion, yellow or orange front, black on rear.