Russia 1963  Cover, Space, 15.05.1963. Riga. 

If you are unable to combine lots with one common delivery, then write to me and I will make you one common lot.

If the total price is up to $8.00, a simple letter $5.20 (weight 21-100 gr);

total price more than $ 8.00, - registered letter 21-100 gr.(approx up to 15 covers) $7.50,

UK - $8.50,  Norway and Switzerland - $9.90

weight >100 gr.  price +20%