1978 Malawi 10 Kwacha WWF Conservation Sable Antelope Proof Silver Coin

Description

This Malawian 10 kwacha silver proof coin was minted in 1978 as part of a collaboration with the World Wildlife Fund and comes with the original certificate of authenticity.  This coin's reverse pictures a proud sable antelope standing alert, and it weighs at 35g of sterling with a mintage of just over 3400.
The coin is displays minimal damage, but toning is present on the reverse near the rim both above and below the sable antelope.  There is also a milk spot to the right of the head on the obverse.  The toning near the bottom of the reverse is pictured in the least flattering light possible to give an example and I would have liked to picture the milk spot, but I can't get it to show.  Further, it seems some debris has made its way into the capsule, although that is a less permanent problem.