Why aren't there more Proof branch mint coins known?

The various mints seem like they made them all the time. From the 1838-O Half, to the 1907-D Twenty. With no consistency, they were all over the court. CC morgans for various years, O mint morgans, 1844-O Ten, Barber coins....it just wasn't special events or first year coins. Do you think that most are accounted for?
Seth
Seth
Collecting since 1976.
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By that, I mean that I have seen many so-called branch mint proofs offered as such, when, in fact, they were only regular issue business strikes that happened to display proof-like surfaces.
True branch mint proofs are indeed rare, special and intriguing.
dies were never prepared as proof dies so the coins weren't struck. When
they were struck it was intentional and in limited quantities.
I've seen a few of the Morgans, the Norweb 1838-O Half, and those were obvious to me that they were Proofs, my question for you is.....out of all of the known BMPs which one has the weakest argument for being a BMP but is still classified as such?
Seth
Mark
However, regardless of what you call them, certain issues have only lately been "discovered", for example the 1876-CC dime, which in recent sales is selling for big bucks in highly PL condition. Go back 10 years and you will see PL examples being sold for much less. The difference? Part of it is the services putting "specimen" on the holder, and part of it is collectors deciding that ultra DMPL coins are worth very high premiums. Similarly, 1876-CC quarters have from time to time been described as unltra DMPL, and I suspect that if you find the right one you could get it into a "specimen" holder. However, the services have not yet "blessed" any 76-CC quarters in this way.
Certain CC Morgans are also widely accepted as BMPs, again, only the coins themselves can speak to the accuracy of this attribution.
<< <i>The 1875-S 20c is probably the strongest exception, as there is a die marker and all the coins are obviously PL. >>
And all of them have been cherrypicked out of dealers stock as cleaned Uncs.
I have seen several alleged examples of the 1875-S branch mint proof 20c piece over the years and most, were far from convincing. Ditto for a number of so called Seated Liberty and Barber branch mint proof examples.
I did see an 1891-O Seated Liberty Quarter when I worked at Steve Ivy Rare Coins (which later became part of Heritage) - It sold in one of their auctions, some time between 1979 and 1982. I saw it again years later - it looked special!
As you mentioned, some of the branch mint proof Morgan Dollars are quite convincing - I was fortunate to have seen a number of them while at NGC. Some were "no brainers" but a few were much tougher calls.
Of course, the most famous and valuable branch mint proofs are the 1894-S Barber Dimes. They aren't as well made as Philadelphia mint examples, but, they certainly have an incredible mystery, history and lore about them.
Several other 1838-O's that I've viewed are much less convincing....less deep mirrors and obvious contact marks.