Beatiful coin mschweiz. You have 1 Thaler 1844. If the coin measures 38 mm in diameter weighs about 28 grams, it is a thaler. If the coin measures 30 mm in diameter and weighs about 14 grams, it is a 1/2 thaler. These superb silver coins are well sought by collectors and are minted in two cities: A is from Vienna and M is from Milano (Milano coins are rare and very valorous). You can find the letter under the head of Ferdinand I. Here are some approximate catalog values:
1/2 THALER, A mint
worn: $40 US dollars approximate catalog value
average circulated: $80
well preserved: $160
fully uncirculated: $300
1 THALER, A mint
worn: $50 US dollars approximate catalog value
average circulated: $100
well preserved: $200
fully uncirculated: $350
1 Thaler 1837M and 1938M are rare, multiply the value above by 5 times.
The coin in the picture is from Auctioneer Bruun Rasmussen in Copenhagen and was sold for (are you ready?) $1100 US dollars during a 2010 auction. The high price relative to catalog value shows that catalogs are only general price guides, and not absolute fact. If you are selling valuable coins, it is wise to employ a high-quality auctioneer, because sometimes you can do much better than catalogs indicate.