As long as you are confident they are bullion grade, however even then if Silver does keep rising the numismatic value won't matter. Then again if Silver falls and you have them cleaned then they do lose any Numis value. Personally I wouldn't worry about it, but if you want to go through the process it is your call.
I cleaned mine. The only reason I got them was for trade in a shtf situation. Nice shiny coins, that look like silver. Not black pieces of metal Given I got them as a bulk lot, I don't imagine there would be anything special in there. I used silvo.
Unless it's a 1938 crown which is 90% numismatic on value, cleaning is fine. I clean my own, even the 1937 Crowns. They trade mostly on silver content anyway and look pretty as a button cleaned up.
In the US they are big on cleaning coins but talk to alot of coinies over here and its a definate no no, it is too easy to damage them. Unless as Austaker puts it you are sure they are just bullion coins, then again who is to say what a num or bullion coin in 10 years?
I cleaned some with cloudy ammonia and they look great and look like the rest of my silver. Mine is just silver no num value. Going to try ultrasound as for quantity cloudy is an effort. Nice crowns..... want to sell me two? See post in wanted to buy/swap.
I bought a bunch recently and they feel all grimy and greasy, yuck, I'm itching to clean them. I don't care so much about shinyness. It just sets my teeth on edge to touch them. Should I just use detergent? Is the greasiness because of some polish used in their past or just the grease of a thousand palms (urgh)
That's why you use cloudy ammona. Don't breath the fumes, do it out side. I wore gloves and used a glass jar. Place coins in jar Add cloudy enough to cover Swill around Have dinner Get coins out with spoon and place in sink full of water Wash with detergent Remove and dry Shiny silver
If they have been stored in old PVC holders, after a while the PVC breaks down and gets slimy. After further time this slime starts to eat the coins and turns green. This is when the coins have reached a critical stage in t heir Numis life. If it is a High Value coin then Restoration is required but this is expensive and requires very specialised techniques. If on the other hand they are bullion grade and have no Numis value then go a head and clean them. This will be better for them in the long run than the slime. My 2c worth
