US Newspaper Periodical Opinions sought

The cat #s would be PR18 & PR19. They appear to be forgeries. Some of these issues were 'reprinted' - the reprints are extraordinarily rare - and should not be confused with forgeries. 

thanks, what i was expecting

Were these used with an intent to defraud ?  I cannot believe that was the case. If they were sold and used why weren't the design changes spotted ? was everyone sleeping back in the day ?
I don't think these can be called forgeries, if only because of the design changes. So are they not just some fun reproduction to be classed simply as a Cinderella ? They look like it to me.
I have some similar that are just fun things to have in my Cinderella collection, not in a forgery collection.

Londonbus1

I don't think so, given that there are multiple denominations in the same sheet, which is a dead giveaway that these are not the genuine article.

Of course, if the original buyer separated the stamps...  Yeah, they are still not genuine, but the non-US collector may never have seen a genuine one and simply not know it is fake.  How many of us really fly-speck every stamp we get.  Most of the time, we're just pretty happy to have found a premium item and are satisfied to pat ourselves on the back.

A lot of people who produce/sell "reproductions" often use this excuse to wash their hands of responsibility:  "I sold it as not genuine, but what the buyer does with it is his business."  Of course there are those who buy modern reproductions and then promptly attempt to sell it on another venue as genuine.  It's interesting how many Cultural Revolution PRC stamp reproductions are on the online market today listed by individual sellers -- the perforations always look way too clean and the paper too high quality.

Some collectors will "honestly" put "reproductions" in their collection as a "space filler" (I actually knew someone who deliberately shopped around for these to finish off an album page, and even a website that offered to reproduce "authentic looking" physical/digital stamps for a fee).  But when the collection exchanges hands, who's to know that some of the stamps were reproductions?  Most buyers don't sit down and examine every single stamp before purchase.  I once purchased a collection which contained ~20% repaired stamps -- I happened to only quickly examine the ones that weren't repaired.  Fortunately, the good stamps more than made up for the seller asking price, but still...  

I miss the good old days of youth when I was just happy to get any stamp, without concerns about whether they were real or not, valuable or cheap, mint/hinged or used, perfect condition or damaged...