Wouldn't surprise me. Most American hunters are scope-crazy and only a few of us still like receiver sights on our carbines and light rifles. maybe they figured, "Why bother?"
As an example, one of my neighbors has a huge Simmons 4x-12x A/O mounted on his 336....turned his handy carbine into an unwieldy hunting tool. I had advised him to consider a Williams - or a compact 4x if he had to go to an optical. His is fairly recent manufacture - and has the two holes for mounting receiver sights.
Stinger, I'll save you some poking around in old threads.
Here's the sight that Jim's talking about. It's a Skinner sight that I put on my Marlin 1894. I found out about these on the Marlin forum.
These have a screw-in aperture that you can change out to different sizes. I have two sizes; one very small for target and sight adjustment and one regular for most any other time. You also can just leave the aperture out and use a ghost ring.
The set up is fully adjustable, too. Very ingenious little set up. I like it.