I Feel Like I Scored, A 1935 British George V Half Crown For

I feel like I scored, a 1935 British George V Half crown for 20 cents

OK so I have decided I want to do a crowns of the world set (ordered a dansco album for it) mixed with world bullion.
So I head to my local coin shop, now I had done some research and have educated myself a little on crowns and ask if they had any foreign crowns or any silver foreign junk coins. I am completely skunked as the shop mostly only deals in US coins being a a US shop. The lady does bring me up a bucket of just random foreign coins that are just 20 cents each, probably just where they dump all there foreign coins when someone tries to sell them.
I decide I might as well grab a few of the Brittania pennies that I like as they are cheap and fun and going through the coins I discover a 1935 half crown which I know is %50 silver. I mean this is a coin shop that has thrown a %50 silver coin in with random junk foreign coins and pennies. I mean I wouldn't expect a normal store to know the difference or your regular average joe but good gravy this is a coin shop selling a $5-10 coin in a junk bin.
I felt like I finally scored I always check coin stars and never see anything I feel I never get that lucky silver coin find so score and a coin shop none the less.
Do you think British coin shops do this throw all the random a US coins in a junk bin including the occasional 1968 Kennedy half dollar.
I also grabbed a Elizabeth 1955 half crown, a Elizabeth 1965 chuchhill crown (it will likely go into my crowns set until I get more because why the heck not kind of cool looking coin and it was 20 cents) and some random pennies and centavos I just liked the design of figured fun little coins. I also got a brittania one ounce and silver eagle for my set.
Still love the silver coin for cheap though :)