Victoria 5 Pence Watermark, Crown/Double Line A?

Hello,
I hope my due diligence has paid off and this is an inverted Crown Over Double-Line A watermark.
Am I correct?
Is there anything else of importance?
Thank you.

MNH4me,
Thanks for sharing this stamp from your collection.

The Australian Commonwealth Specialists' Catalogue Australian States Federal Period 1901-1912 notes that this stamp, issued on Double-lined A thick paper, perforated 12.4 x 12.2, was printed in equal proportions of upright and inverted watermark.

Oh how interesting! Thank you so much. I read on another site that mostly pertained to Scott numbers where it was noted that there was no differentiating number for the inverted, so it must be an error. Thank you for clearing that up and for the link!

The paper used was twice as big as the printing plate for the stamps. The process for printing these was to print half the paper sheet, remove it, turn it and print the other half. This is why the watermark orientation is 50/50 upright and inverted.

I'm sure that I'm not the first to ask but, Why? Would have been less work to print both halves in one operation, with maybe a dividing line in the center between each half sheet.

It should be noted that the same catalog mentions the next printing as, "Watermark Crown over Double-Line A, Thin Paper, pre-gummed paper". In this issue, "The watermark is found only upright, indicating the sheets were divided in half prior to printing."

I guess instead of purchasing new printing equipment that could handle the larger paper, the easier solution was just to cut the paper in half.

Note that this second printing was in October 1912, was in a slightly different color (Deep greyish brown rather than Purple Brown).

By the way, if you find a thick paper version perforated single line perf 11, you've hit a small jackpot. Measure those perfs carefully.

It would require a second plate. Either the press was not configured for two plates, or a second plate was not available. In that case, you must turn the sheet 180 degrees to print the unprinted half of the sheet with that same plate. Consequently, you will have half the sheet printed upright or sideways and the other inverted or sideways inverted.

If you could just shift the sheet and print again, the press must have allowed for three plates to be used contemporaneously. If not, the shifted sheet must be folded or have been hanging over the edge.

Shifting the sheet, then, still is less efficient than turning it and passing it through the press again.

Edit: typo

NSK Thank you.