Certainly: Anonymous.
it doesn't necessarily have to be 100% comprehensive - otherwise you truly will be there 'forever' trying to compile.

I even think there are sort of 'forum tools' which could allow a member (in an ideal world) to log on - go to site - register a 'tick box' list (like a voting mechanic almost).....

...perhaps doing lists by manufacturer....

.... or perhaps (as in this instance): centering on a set of specific guns to solve an issue or test a market:

ie List No 1 "Vintage and antique Springers".
Got to be good for Webley and BSA alone as a starting point?
(eg BSA: Lincoln Jeffries, Model D & B, Standard, Light.... through breakers to Airsporter, and for Webley: Mk1 & 2 service, Mk3, etc).
All Old/Classic/Antique - and all facing similar spring supply issues?