Thank's for the replies so far. Badger- I have been through all the references I could find on the site and was hopeful based on comments about observed 2 groove T's, etc. I should note the rear sight is currently off the rifle but is not correct for a "T". One thing I find a bit strange is the thought that H&H wouldn't stamp a "T" on the body on Savage conversions (as on the example rifle on the forum). Also, with regard to the "TR" found on Britishicon manufactured rifles selected for conversion- do we know for certain Savages selected were not similarly marked and, if so, was it because they were not selected in a similar manner? The S51 being absent on the butt doesn't seem conclusive to me as butts get changed and, from the references, it seems the S51 may not be present prior to a certain point in time. Another thought- the S51 is well known and would, to me, be the easiest mark to fake (about the only thing I would be capable of doing!).