Is this stamp a "forever" stamp?

Details of the 6 November 2017 releases below

$1 Rhodonite stamp

Special $1 Rhodonite stamp from the Rare Beauties set

This special stamp was released on 31 March 2017 at the Melbourne Stamp Expo.  It was the single stamp in the Day 2 Minisheet.  It differed from the other $1 Rhodonite stamps.

1)  It had a lump of rock attached.  The rock was 2mm high and stuck near the top left corner of the stamp.
2)  It was a different size = 27 x 36.5mm.  (The other $1 Rhodonite stamps were 26 x 37.5mm.)
3)  It had a different perforation = 14.1 x 14.3.  (The other $1 Rhodonite stamps were 14.6 x 13.9.)

 

Postal History:

I wondered how the rock would survive going through the mail stream.  I put a piece of cardboard in an envelope, sealed the envelope and affixed the special stamp.  I addressed the envelope to myself.  I have posted it in roadside mailboxes around Melbourne.  Here is it's postal history to date:

Postings #1 - #2:  April 2017.  No change.  Rock intact.  No postmark.

Posting #3:  Rock removed.  Black barcode on front.  Red barcode on back.  No postmark.

 

Postings #4 - #11:  No change.  Still no postmark!

Posting #12:  Red barcode on front.  Black "DLC 992-4, 19:27, 17/10/2017" codes on front.  No postmark yet!

Posting #13 - #15:  No change.  Still no postmark!

Posting #16:  Posted on 20 December.  Arrived on 2 January.  No postmark.  Yellow sticker with red barcode added to front of envelope.

Posting #17: January 2018.  This time it got 2 barcodes but still no postmark.  A second yellow sticker with a red barcode was attached at the bottom.  A different red barcode was printed across the top.  This top barcode has gone across the top of the stamp hence proving that the stamp has been through the mail stream but I'm not counting it as a postmark.  (This barcode is different from the one it received on the back after Posting #3.)  I wonder how often they turn on their postmarker?  9 months without a postmark is amazing!

Posting #18:  No change.

Posting #19:  The yellow sticker has covered the suburb and State text, so I have added them back.  "DLC 19/03/2018" stamp + red barcode on back.

 

Posting #20:  No change front or back.  12 months without a postmark!

 

I shall post it again soon.

 

Updated:  30 April 2018

$1 Rhodonite Stamp Summary

This stamp was issued/released as follows:  [Sheet stamp + 19 variations]  ($305.40)

Note that the variations released on 6 November 2017 were in a limited edition Rare Beauties Minisheet Collection.  It contained 14 minisheets and cost $149.95.  Limited edition = 200.  Face value of the stamps = $36.

Perforated gummed stamp:

Sheet (Se-tenant pair with $1 Golden Sapphire stamp) - Issued 30 March 2017  ($2)

2 pages in the Prestige Booklet (Block of 4 of the same stamp, Se-tenant block of 4 with other $1 & 2 x $2 stamps) - Issued 30 March 2017  ($30.95)

 

Minisheet (Se-tenant with other $1 & 2 x $2 stamps) - Issued 30 March 2017  ($6)

2 large minisheets of the same design and size as the Prestige Booklet pages (Block of 4 of the same stamp, Se-tenant block of 4 with other $1 & 2 x $2 stamps) - Released 6 November 2017  ($149.95)

   

Special Expo Day 2 Minisheet (pair of stamps) - Released 6 November 2017  ($ included above)

Imperforate gummed stamp:

Imperforate Prestige Booklet (Block of 4 of the same stamp, Se-tenant block of 4 with other $1 & 2 x $2 stamps).  [Individual stamps not valid for postage.  Only whole pages are vaild for postage.] - Issued 30 March 2017  ($50)

Self-adhesive stamp:

Booklet (with $1 Golden Sapphire self-adhesive stamp) - Issued 30 March 2017  ($10)

Cancelled gummed stamp:

Special Expo Day 2 Minisheet attached to a Medallion Cover (pair of stamps).  [Stamps already cancelled hence not valid for postage.] - Released 31 March 2017  ($49.50)

Special minisheet:

Expo Day 2 Minisheet containing a single stamp with rock attached.  Different stamp size and perforation from above issues/releases - Released 31 March 2017  ($3)

Special perforated gummed stamp:

Single stamp with rock attached removed from the Expo Day 2 Minisheet - Released 31 March 2017  ($3)

$1 Rhodonite stamp