Please help identifying these chairs  

Looks like a pretty generic industrial Danish design from the late 60s, early 70s. Anderstrup and Korup did produce quite similar designs. But I don't know what exactly this is. Maybe @mark737 or @lexi can do their usual wonders with an image search. 🙂

@krissy. A basic google image search suggests these chairs are by D-Scan, usually made in Singapore.

I agree on the D-Scan ID - there's a marked set on 1stDibs with many good photos.  In addition to Korup and Anderstup, as Herringbone mentioned, another maker I came across who did a version of this chair was IMHA of Germany (photo below).  IMHA apparently stands for  International Möbel Handelsgeselschaft, and was said to be part of the Musterring group. That's a new one for me.  @Herringbone, are you familiar with this brand?  

@mark737 I'm not very familiar with German furniture design because I haven't seen many designs that I liked. In my opinion, German furniture in general lacks the elegance of Danish design. At most, Wilkhahn and Hartmut Lohmeyer were outstanding, although if you take a closer look, his designs also work for me mainly because they were heavily Danish-inspired.

I am of course familiar with Musterring as a major brand that is still active and under which, as far as I know, many manufacturers operate. However, IMHA doesn't ring a bell with me.