(Hmm... my last post didn't go, apparently- hope this doesn't end up being a double post.)
My first silver coin was found in the early 1980s. It was a dateless Standing Liberty quarter. My records got lost when I went off to college in 1984, and I quit detecting from 1984-92.
When I resumed detecting in '92, my first silver coin that fall was a lovely AU 1956 Washington quarter with nice luster. That is where my silver count officially begins, since it marks where I started keeping count again. I have kept the tally running until today. It's up to 185 now. That's not a lot compared to some people's count, but I don't get out as often as I used to. My best in one day was
five in one hole.
Your first being a 1943 Mercury dime is not at all surprising. I suspect that a Merc dime from the 1930s or 1940s is the first silver for many, many detectorists.
As a matter of fact, I am hosting a
"first silver betting pool" (giveaway) on another forum, in honor of a member there who hasn't found his first silver coin yet. Basically, whoever guesses the closest to whatever his first silver coin ends up being will win a bronze medal from me.
He's getting tantalizingly close- the signs are there that it's just around the corner for him... he has an 1899 Indian cent now, and some older relics. If I wasn't the one hosting the giveaway, my prediction would be for him to find a Merc dime from the 1940s.
That just statistically makes the most sense. I think the Mercury dimes are the most common silver coins out there in the ground. Some will argue that silver Roosevelt dimes are more common. Certainly the silver Roosevelt is also common, but I find more Mercs, fortunately. For a while the totals of each were neck and neck, but Mercs finally took the lead and held it.
The Mint struck Mercury dimes for 29 years, versus only 18 for the silver Roosevelts, so the Mercs had longer to circulate and get lost.
Of course, some folks start out with something wild. That's one great thing about this hobby... you never can tell WHAT will come up!