1954 Vatican medallion set?

I've got it a couple of years ago but was unable to find any information on this item. Seems to be  1954 (or around it) "THE HOLY YEARS OF THE XX CENTURY-GLI ANNI DEL XX SECOLO" set, high relief (probably pewter?) medallions of rather high quality - but nothing else and even almighty Google didn't produce any valuable information...
Anybody knows what is that and how it can be valuated?
Thanks in advance.

Top left is a centenary medal for 3 different popes,  Example Here

bottom middle Pope Pius XI 1925 Holy Year Medal, example Here

bottom right is 1950 POPE PIUS XII Medal for Holy Year but I cannot find out its value so far.

I smacked google around a bit to get answers.  

Thanks Fluke,
I was looking for the whole set without realizing that they also come separately.

They are really hard to track down, I found those 3 from google images after having to reduce the search down to --> "Vatican" medal coin "pius"

adding " " around a word in google will force the search results to contain that word, in this case its pius and Vatican but it will bring up medals/coins or both.

I tried a lot of combinations but yours are very hard to track so opted for the google images approach when web results were bland or of sites links to web pages that no longer exist, plenty of other medals came up but not yours, at least you know they are not the common variety of medals.

I now realize that they are not common and they are definitely not cheap Italian souvenirs as I initially thought - not bad for something I've got for a couple of dollars.
I don't collect such things and will eventually get rid of them but would like to learn more about them, it seems that  there are more of such medals and such sets around. Sadly, my Italian language is next to nothing but there must be more info on such medals in Italian. I'll keep digging and, maybe, at the same time will learn a couple of new tricks about Google search.

It is a very useful search option to put quotation marks around a word or the entire search sentence, it weeds out the non helpful results. But don't add any ,-=+@# etc. characters within quotations.

They certainly are the rare variety, nice purchase  

I recently read in the news that Google may be forced to disclose their search algorithm and maybe than I'll learn more on how to use it.
With the medals - unfortunately they don't look like original issues. My uneducated guess is that they are smaller (26mm instead of original 40 to 55mm) copies of the rare papal medals.  
Some of such copies fetch $8 to $12 a piece or around $50 per set on eBay and still are rather uncommon items though.