USGI,
That site has been infected all over for almost two years and the owner must be brain dead too. All good AV programs throw alerts when accessing it. I wouldn't download anything from there either.
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Your answer directly implies that there is a T105 rear sight that is something other than Post-War. That is not true. No matter who did it.....it's misleading at best.
PS, not sure how (or why) you accessed that site, but my AV says it's a pest-hole that the prudent should run, not walk away from
The question was asking for identification of the sight knob markings.I saw no question about a sight ID.I implied nothing,I simply repeated published information.I was warned this sight was a waste of time populated by swelled heads.Adios