Includes SG Z58 for the 4d carmine. The 8d blue is NOT listed in Gibbons with this watermark (crown CA) but definitely exists. The normal canceller for Mauritius was B53. B62 was assigned to Seychelles. Although these are only partial strikes, it seems reasonable that they are B62 cancels.
Gibbons lists the basic stamps at 95 GBP for the 4d and the crown CC 8d at 40 GBP. Based on this, the condition and the scarcity of the cancels, we would estimate the value of the lot at $135. The stamps offered here grade between 75-80 as follows:
