I'd call this "scarce", not rare by any means but this little known 53 Dorman Skowron is super tough. Took me 4 months to find one when I put my set together. I got it raw and subbed it myself, presents better than a 1 (crease free, got lucky), but it's stamped and was sent. A quick check on Ebay currently and there are two spendy but decently priced...that was not the case when I was looking of course.
About as "scarce" as anything I have...I'm sure the 63 Fleer Checklist doesn't apply...haha. I guess I'm a pretty boring post war collector.