One day when I was really bored, I figured out how many guns you would need for a "complete" collection of the Security, Service, and Speed Sixes. Including the real rare stuff, like the early prototype Security Six 3" fixed sight DAO .38 Special that was sold by Ruger on GunBroker for like $2,000+.
It was over 400 revolvers, with one for every variation.I don't even know how to get a complete list of every variation.......you have early light barrels, heavy barrels, Heavy Machined barrels, "transition" guns that have ribbed triggers, non-scalloped recoil sheilds but have heavy barrels. For example, just to get the 1976 BiCentennial guns, there would be like 30+ of those alone.
Then you have the ones marked for the FDA, the ones marked "U.S.", various police marked guns......
Basically, in short, unless you have deep pockets and can afford to buy 20-30 of them a month, it woud take the better part of a lifetime of devoted collecting to amass a "mostly complete" collection of the Six revolvers. Some would be very hard to find, if not impossible, since the rarest ones are buried deep in Ruger collections and probably will never be seen again.
I myself am happy to keep buying the holster worn 4" PD and security trade Service and Speed Sixes. The Security Sixes never got me all that excited, but neither does any adjustable sight revolver.