Found in a roll of halves???

Does anyone know what this coin is?
I was searching a box of halves and found this in a roll.
It is a proof coin. Fields are mirror like and devices appear to still be frosted a bit.
The reverse says 25 schilling, Republik Osterreich
Joe
I will be going out for a couple of hours but will check back about 7:00 pm.

EDIT: I forgot to mention it has edge lettering.
SCHILLING FEUNFUNDZWANZIG
I was searching a box of halves and found this in a roll.
It is a proof coin. Fields are mirror like and devices appear to still be frosted a bit.
The reverse says 25 schilling, Republik Osterreich
Joe
I will be going out for a couple of hours but will check back about 7:00 pm.
EDIT: I forgot to mention it has edge lettering.
SCHILLING FEUNFUNDZWANZIG
0
Comments
.3344oz. ASW
If there are 9 shields on the reverse as opposed to 10, you're looking at a lot more money according to my Krause.
It has 10 shields on the reverse.
Dumb ? What does ASW mean, I assume silver.
Joe
Well, just Love coins, period.
<< <i>ASW = Actual Silver Weight >>
Thanks,
Joe
Jim