First Series Postage Dues 1906-1928 2-D Lathework Question

I have recently added the imaged item to my collection.




My 2013 Unitrade catalogue has the lathework details in the Admirals listing. The type A lathework is only listed for the 2c postage due in the violet shade. This stamp matches the reddish violet of the 1928 printing. The latter is listed only with the type D lathework.

Can anyone explain what I am getting wrong here?

I'm not an expert but will say it is beautiful! Nice addition to your collection. Hard to beat intaglio/engraved stamps ... looks like currency.

Great item! Not an expert on lathework (hopefully one will chime in), but 2021 Unitrade has the same info.

Type A on J2 (1906 printing), Type D on all 3 printings - J2, J2a (thin paper), J2c (reddish violet)

See Canadian Postage Due Stamps (Andrew Chung & Hans Reiche, 1985, Perfect bound, 67 pages)
Here is a listing of many different stamps with lathework http://www.dglphilatelics.com/adm_lathe.html

Fascinating thread, I really enjoyed the information.
Great link Jogil.

So, I make John's example Type A on the postage due.
I would be circumspect as to the "Reddish Violet"
I would tend to think the violet has degraded due to soaking / chemicals.

....and
What is the significance of the quadriga of Maltese Crosses in the lathework

I suppose there must be some shade variation in the wet printings from violet towards reddish-violet.

Seems to me there's a fair amount of variation in the J2 shades first issued in 1906, ranging from violet, dull violet to reddish violet - not surprising given the length of time they were in issue.

Also find the reddish violet often doesn't show up in scans/photos well, but is very apparent when viewed in person. Example below.

Below pic - top row is J2, bottom is J2c (reddish violet).

Hi gmot
Are you sure J2c (reddish violet) is the bottom stamps..Could it be the top two stamps..Just saying

Robert

Yes they are, and your comment makes my point about lack of scanning colour fidelity perfectly!

Here is the page I have put together. I don't have enough dated copies of the darker shade to determine an early date.




I realise I have the number printed wrong.

Hi gmot
Below I isolated the colours..But remember your computer, my computer and all others are not synchronized to adapt to all colours..Which is impossible to achieve...So we {collectors} can only give an opinion when it comes to colours.

Wish Don the moderator could chime in..He knows a lot about this and has taught me things.
Nice stamps though..

Robert

Printing plate 1 has no lathework 1906 (wet printing) [J2].
Printing plate 2 has no lathework 1906 (wet printing) [J2, J2b].
Printing plate 3 has lathework A 1917 (wet printing) [J2].
Printing plate 4 has lathework D 1921 (wet printing) [J2, J2a (1924), (J2c?)].
Printing plate 5 has no lathework 1925 (dry printing) [J2c (1928)].

wert, in my opinion, and I'm not criticizing your work but I don't think it's accurate how you isolate the colors to determine the color of the stamp.
Your device or program is probably reading one specific pixel at a time and not the entire image as our eyes can.
I don't even know if there is a program that can do this with some degree of precision.

for comparison, your two images put together


tiny little spot magnified showing a lot of different colour pixel on top left stamp

Here is a dull violet color for this stamp: https://garylyon.com/products/canada-j2-2

Thanks Jogil, some nice material there.

wert, I appreciate you looking into this, but I have the stamps in my collection, and know how they look "in the flesh". So doing a detailed colour analysis of a scan with unknown compression/correction is proving the point I originally made that shades may not be represented accurately during that process...

In any case, 64idgaf, I apologize for sidetracking your thread!