All this talk of the Model 66 put a bug in me to go looking for one myself. Believe it or not, I've never had one.
Found a beauty today after work. It's pinned and recessed (dash one), snub barrel, round butt frame, in very sweet shape, locks up tight, no timing issues, and has a great trigger action for (after a bit of haggling) $600.00. Manufactured in 1980.
No original grips, box ner nothin' but that's fine. It came with some nice Hogue neoprene grips exactly like Swag's (same contour despite it's being a round butt frame). If I carry it, they will come off and get replaced with compact wood grips.
Everyone should have a 66 and/or 19 just on principle.