I am putting together some information on these, I have most of the pictures done but am still doing some research for the written information to go with them. I now know way more than I did a couple weeks ago.
I am surprised there is that much height difference in yours, it should be taller but I did not think it would be that much. It looks like the rear of the base might be above the wood more than usual? You often see these with the base bent up slightly at the rear.
Here's a comparison picture of three SM code sights for the Savage pump 22's, the one with the No 47 stem is an actual No 52 that came with the No 47 stem and is the only one I've ever seen with a box so it can be Identified as one. I though they might have furnished a shorter post on No 52's but it is the same height as the standard one and it does not adjust ae low.
There is nothing marked on the sight to indicate it's a No 52.
I have 4, the one by itself had the original stem cut off & another one brazed on, the one with the very short base had the post shortened quite a bit and the base modified with notches for some other use, the No 47 stem is good and will go in something else some day.