I picked up my new to me auction-bought no-dash 66 at my local FFL today and wanted to throw out some features to see if there are any variations from the typical no-dash 66.

First, it's a Treasury marked (not the ATF commemorative) unit. I'll try to get some decent photos when the light's better, but for now will just describe.

It has a small S&W logo on the left side (seems like j-frame size, not standard K frame size), and the UTS logo on the right. I'd assume the pinned and recessed with stainless rear sight is pretty standard model 66 no-dash.

The 'marcas registratas' stamping on the right side is larger than on my 66-2 and 67-1 units. BBl stamping looks pretty standard. But the front sight caught my eye, the blade (though stainless, no orange insert) is a pinned-in piece, not integral with the bbl like on the other two units mentioned.

The stocks appear to be original, not numbered, rosewood targets with the football relief for loading (bookmatched). The frame ahead of the rear sight is grooved same as the bbl and sight assembly.

This particular pistol has seen some respectful carry. No marks or scratches on the metal, but light finish wear near the bottom edge of the grips like it was carried under a garment.

The trigger (grooved, std width) has definitely been worked on. It's the cleanest breaking S&W trigger I've ever felt. It has virtually no cylinder end shake. Tightest I've ever seen. Clean double action almost like it's been shimmed (no drag). The cylinder appears to have been lightly 'dehorned' between the lightening cuts. Could be factory but I doubt it based on light tooling marks.

I'll probably letter it, but was wondering if any of the features described differ from a standard no-dash 66.

Also, I know there are retired agents on the forum, what kind of leather would it have been carried in?

Someone cared for this pistol very well.

Other than the trademark (and logo), it sounds like a standard early Model 66 below 7K5xxxx(ish).
When they put something on the sideplate, they usually had that small trademark under the thumbpiece.

I don't think it's a commemorative though and could have been ordered by the Treasury Dept with the logo.

It's the same 'UTS' logo as the 66 in the post from 2010, similar subject. Only it's a square butt, 4" instead of the previous photo (2.5" rd butt). It has the T prefix serial number. The letter from the previous post indicates a quantity of 70 (unclear if 70 in the special serial numbering sequence, or 70 in the shipment). S&W may have started the T sequence at T1001 or similar. The serial of mine is T10xx (well below the 70 quantity indicated).

Is the "T" number stamped in the yoke cut and on the butt or is it under the cylinder on the left side of frame?

Just revisited this post and noticed I didn't answer your question. The same T10xx number is stamped inside the yoke cut and on the square butt frame bottom. I mentioned this pistol to a fellow collector at work and to my surprise he says he has the 2.5" version. I'll have to get them together for a photo shoot. Said he bought his through one of the large wholesalers years ago.