Anyone Know About These Off-Planchet Silver Strikes?

Most likely PCGS 25 cent coin if was in new true view holders will have a faint 64 date showing and PCGS at times miss labels Canadian coins as PL and MS

Canadian Proof-like sets were produced until 2010. Starting in 2011 (technically, starting with the 2010 special edition set), Canadian mint sets included regular business strikes (which grade as "MS").

Specimen sets have been available for many years historically, and were produced for sale to the general public starting in 1970/71. From this point up until 1995, specimens and proof-likes are extremely similar and although I have never tried myself, I would imagine PCGS would likely confuse the two. Starting in 1996 Canadian specimen coins have a distinctive finish which you can see for yourself if you look at the pictures on the mint website.

Actual "proof" sets were not produced until 1981. They have always featured a strong cameo and heavy contrast with the fields, which are extremely reflective. PGCS grades these as "PR" (not P) and I usually see other grading services use "PF" instead.

The coins in the pictures in the ebay listing appear to be prooflikes to me. @john100 is correct that PCGS is prone to confusing PL and MS but I believe they got it right with these coins.

The above is correct to the best of my knowledge, if you think I made a mistake, just let me know.

Edit: To clarify the difference between PL and MS coins is that PL coins came from mint sets, while MS coins came from regular distribution channels (rolls, bags ,etc). As a result PL coins were handled carefully and will usually be seen in higher grades. Business strikes are handled in bulk and as a result have more marks and flaws coming out of the mint. Hence a pristine business strike / MS coin is much less common than a PL coin of the same grade and will be priced as such. Since 2011, mint sets contain regular business strikes, making it easier to obtain better examples of those coins, if you go through a few mint sets and cut out the best ones.

If the coin has wear, it would get something like "AU-50", not MS or PL, since it's circulated. It's technically still a PL strike but as far as technical grading goes you have to treat it as circulated.

Proof likes are also struck at least twice under higher pressure. It makes the strike of design more sharp to a trained eye.

There may be other ways of telling but I'm not sure I would want a circulated proof-like, except as a novelty perhaps?

That would be nice to know, but unfortunately, difficult for us, since none of us actually have the coin in front of us, and it's in a slab as well, so you can't weigh the coin directly without opening the slab.

A magnet would do wonders though.

With slabbed coins you now have two questions to ask:

1) is the slab authentic?

but more importantly,
2) is the coin authentic?

1) helps in determining 2) but the latter is usually more difficult than if the coin were raw (in which case the former would not apply anyway). Slabs seem to help novices have a sense of whether a coin is legitimate but an expert in the area would have better judgement anyway.

With the dollar coin, struck on the 50¢ planchette the design does not look flawed at all, when iv seen other examples of larger coins struck on smaller planchettes the design is not usually fully on the coin. This looks like a 1$ die that was made smaller to fit perfectly on the 50¢ planchette. Is the consensus here an inside job? As they are graded and authenticated I have no reason to believe they are fake or anything.

The high grades and the back story I have mentioned of one collector owning most of the units at one time just leads to a conclusion of custom made, also nobody I ever heard goes nickel hunting as collectors do for silver, one can almost say the reason these coins exist in these grade is they were ordered just like the famous dot penny. If you like this type of error, just enjoy it, you didn"t order it, sometimes back I shared a 50 cents struck on a loonie it looks perfect like a designed golden 50 cent piece, so sometimes the planchets are really close in size. A comment about size, the dollar offered to me in hand you can tell the coin is slightly smaller

Thanks for clarifying. I figured you out of anyone would know best about the dollar. Awesome insight!