Odd Ball Target Sight on rolling Block

[John Allen]

I picked up another rolling block the other day. It looks like a NYS state contract. It has the correct B on the barrel bands and the HBH Cartouche on the stock. it has the half cock and appears to be bright finished.

Now here is where it gets a little weird

1. On the underside of the round barrel it has stamped "6 grooved quick twist" on it. I have never seen anyone stamped this way.

2. It has some kind of older target sight that is mounted to the barrel.

Has anyone ever seen this sight or markings on a roller before?

Here is the sight picture
120207

[Don McDowell]

That sight looks like some sort of adapation of Borchardt's sight.

[sav300]

Very close to a martini cadet sight.
My7mm OVS rifle has the same sight.

[John Allen]

Thanks all it looks like it is a cadet sight.