It is an air mail letter and the fee paid by Mrs. Ahl was 95 öre which indicates that the letter was weighing 5 g or less.
|Air mail - 5 g, fee: 95 öre|
1941, 23 January. 35 öre carmine-violet Gustaf V, right profile, type II. Qty: 20,000,000.
1939, 10 February. 60 öre red-carmine Three Crowns. Qty: 77,900,000
The clerk at the Post Office in Klavreström used two stamps; the 35 öre carmine-violet Gustaf V, right profile, type II and the 60 öre red-carmine Three Crown. The 60 öre Three Crowns was a pretty common stamps in the forties, its main purpose was to be used for domestic parcels weighing up to 1 kg. It was also the first stamp in the long running Three Crown series - read more about that series here. The 35 öre carmine violet is a little bit rarer, in 1949 there was no obvious single use, but earlier it could be used as a single stamp for registered domestic letter - 20 g until April 1942.