What period might we place this in approximately?

[Babu]

Sorry poor images until it lands in the UK.

I wonder if this is typical of kambun or Genroku?

Regards Adam

[Surfson]

This sword appears to be a naginata naoshi zukuri.   Cut down naginata (naginata naoshi) had become very popular, so in the 16th century and later, sword makers started to make blades that were intentionally in the shape of a cut down naginata.  The zukuri (tsukuri) at the end of the description tells you that this is the "style, model or type" of production.  

[Babu]

Rob are you sure this isn't just an O-kissaki only naginata Naoshi to me are slightly different.

A true cut down naginata would have no turnback of boshi

A copy would but might still have that pronounced naginata shape.

I thought this just an o kissaki?

[ROKUJURO]

The photos are not great, but this does not look like KAMBUN to me. Considering the NAKAGO, it looks more like a SHIN-SHINTO revival piece of a KOTO blade, but an attractive one.

[Surfson]

Babu, please read my post again.  I believe that it is NOT a naginata naoshi.  It is in the shape or style of a naginata naoshi, but purposefully made that way.  Thus, the word zukuri is added at the end, meaning in the style of.   Just my two cents worth.  

[Babu]

Yes your correct it's got turnback on the boshi so your spot on. 

I'm leaning towards shinshinto. 

Simply due to little patination of the Nakago.

[Surfson]

I think that naginata naoshi zukuri have been made in koto, shinto and shinshinto.  Okissaki came back into fashion in late muromachi and on through shinshinto.  A lot hinges on the sabi in the nakago, and I can't tell how old it is.  It does seem to have fairly crisp yasurime, so you may well be right.

[16k]

Crisp yasurime, rather clean nakago, probably late shinto or Shinshinto would be my guess.