Apparently because of different regulations when they were made, a silver dollar contains more silver than a dollar in silver change. The numbers I used to use is a silver dollar had a dollar in silver at $1.2929 per ounce (SC were redeemed at this rate, 0.77 ounce per dollar), but change was only worth a dollar at $1.383 an ounce.
Put another way, $1 in silver change only has 93.5% as much silver as a dollar coin.
Many collectors and hopefully, any coin buyers know this. Unless you're selling by weight, it really doesn't matter much.
I noticed something today that I never saw mentioned before. I was playing around with the silver value calculator at
http://www.australian-threepence.co...n-values.htmIf you put in two 40% silver halves, you get a different figure than for one 40% silver Ike. In fact, the halves are worth 93.5% as much, the same % as on the 90% coins.
This makes perfect sense, since the only change was content, dropping from 90 to 40%, yet I haven't ever seen this mentioned in 47 years of dealing in coins, not even during the 1980 boom.