It is a ribbed 4 conductor connector that has either a 0.1" or 2.5mm pitch. It is a crimp connector (crimp pins then stick in holes). The mating connector mounts on a PCB and has two slots above the 1 and 4 positions for the matching ribs. The back of the connector (where the wire goes) is flanged. It appears to be made of white nylon.
There is a logo on it that I do not recognize. It resembles the attachment.
Slightly different, the PC version has an extra long locating lug on one of the 4 guide lugs(easily removed) but the main difference is in the opposite side. Depending on its use ie not medical or space related, you may just be able to grind the excess bits off, or do you have to source 1000's.
It is not medical, it is a device that I purchased and that is the connector on the end. I am really interested in the mating connector, otherwise I'll have to cut and terminate around 100 of them. If it came to that, I would probably just use the snappable 0.1 header and make sure that I put everything on correctly (at the moment that is what I am doing, purely to save time).