The 'Pentax' logo is an integral part of the metal - it's about 1mm deep and inseparable from the housing. The words 'Asahi Pentax Japan' are engraved into the lower part of the casing.

Thanks for the link, Barrie.

Thanks! it looks absolutely identical apart from the 'Pentax' brandings which seem to be an insoluble mystery.

It looks like genuine Pentax - but no serial number, just a numeral '2'as in middle image above.

Apologies for long silence - illness has got in the way but all is now well.

The bellows are Pentax branded,, but I've not been able to find out much about them. I'll post an image later today.

A few years ago I found a secondhand Pentax Bellows unit with vertical and lateral shift and swing and tilt as well. They were in need of servicing (which has now been done). I can't find any information at all about them - does anyone out there know anything - for example when they were made?

I haven't used them yet but will try them out fairly soon.