ISO suggestion for ca. 1971 Verichrome Pan

I've shot probably a dozen rolls of Verichrome Pan that expired in the late 1960's and early 1970's. I mostly shot it at an EI range of 20-50 and developed in Rodinal, 1+25 @ 7:00, or 1+50 @ 12:30, at 68f plus another 10% or so. There was some fogging, but generally I've been happy with the results. Here are some examples on my Flickr account:

https://www.flickr.com/search/?user...date-taken-desc&text=verichromepan&view_all=1

why not snip off about a frame worth n do a dev experiment?

if you arent dev yourself... how about finding someone in your area that develops like maybe a school or club?... of you were in ny, id gladly give it go with you.