Mongolia. Accumulation mostly ★★ 1990's. Alanta olympics 1996, about 500 of each of five different UNLISTED souvenir sheets from the overprint set (e.g. Mi 2650), further about 100 xx and 200 used minisheets of the Mi 2633-2641 set, more than 100 s/s 258 and about 60 s/s 257.