I have a vintage Reliance jig. Looks similar to cheap Asian devices but cast iron instead of light alloy and well made. Used with bench grinder, does a nice job, drills look factory ground and cut like new. I believe these were sold up to the mid 70s, expensive too! They occasionally appear on market tool stools for a pound or two, well worth picking up if you see one. There are three different sizes, the No.1 is OK for our sizes (about the same as the Asian devices), the No.2 is big, the No.3 is huge.
Dave