your first example=
Western Australia Postal Stationery
Post Card
2d surcharged 1.1/2d carmine on cream card
Period of use 14/11/1912--December 1912
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your second example=
Postal stationery
Western Australia Post Card
1/2d red brown on pink card
period of use 29th January 1890---9th sept 1892
Your cut piece (which includes a human finger print)
I believe is the
left right hand portion of a Type 1 Duplex cancellation
P.O in serifed letters in circle
12 bars (3+6+3)
Source: western australia
the stamps and postal history
the wa study group
1979 isbn 9596476-0-0
Sundry information:
postcards printed by de la rue London.
1/2d represented postcards for delivery within the limits
of the city, or any townsite.
postcards beyond these limits, and within the colony =1d
example:

hope that helps.