Vic 1897 Combination & mixed franking

Of the five recorded covers with a combination or mixed franking of both of the two 1897 Victorian Charity stamps:

only one cover has only one of each denomination;
three of the other covers have the 1d. (1/-) blue in the majority;
two of the five covers were used after Federation on 1 January 1901;
one cover was sent to Germany, two covers were used within Victoria while the other two covers were sent to Sydney.

The five recorded covers are displayed below and grouped as follows:

Combination franking.

Melbourne for local delivery.
22 October 1901.

Single of each denomination tied to a plain cover with a Melbourne CTO cancel. Clearly a philatelic usage.

Status July 1992 Lot 1469.
Abacus Auctions May 2018 Lot 512.

Melbourne to Sydney
25 October 1897.

9d registered inter-colonial letter rate 3rd step: registration fee 3d, postal charge 3d * 3 plus a convenience overfranking of ½d.

Has two pairs of the 1d (1/-) and three singles.

Millennium Auctions April 2003,
Lot 656.
Prestige Philately, December 2010,
Lot 486.

Melbourne to Sydney.
(Law Courts cds of 3 November 1897).

Pair of the 2½d stamp.

6d registered inter-colonial letter rate.

Prestige Philately, January 2004
Lot 626.
Prestige Philately, May 2012, sale 173, Lot 733.

Mixed franking.

Melbourne to Ronneburg, Germany.
25 October 1897.

Only combination or mixed franking cover to an international destination.

5½d registered cover
(2½d foreign letter rate plus 3d registration fee).

Mixed franking of two 1d (1/-) blue,
2½d (2/6) brown and 1d brown Reading.

Has superb Ronneburg arrival backstamp of 28 November 1897.

Abacus Sale December 2019,
Lot 1530.

South Yarra to Stawell
6 December 1905 (very late usage).

5d registered intra-colonial letter rate (3d registration fee and 2d intra-colonial rate).

Same address and handwriting as on a cover shown elsewhere with a 2½d (2/-) pair.

Prestige Philately, November 2011, Lot 493.