Nobody has replied yet, so I'll give my 2 cents worth.
I don't think it would be possible to give a formula for the added value of a cancel on a stamp. At best you will find a rarity factor. For example, town cancels of British Columbia have been extensively studied and are given a rarity factor of A (common) to E (fewer than 10 examples known). I just read an article by someone who has studied E cancels for over 30 years and in his database, E cancels have sold for between $30 and $1300. How could you possibly give a catalogue value in such a case?
A formula for value has been tried in the past. In "The Postage Stamps and Postal History of Canada" by Boggs. Bear in mind that this book was published in 1945, so is almost 80 years out of date. In this book, 7 ring target cancels (in black like yours) on small queens have a factor of between 1 and 1.5. Other colours are much scarcer and worth more.
And I agree with Boggs that these cancels are not rare. I had a quick look through my hoard of small queens and found 10 with a 7 ring target cancel.
7 ring cancels are quite common on small queens and in my own opinion do not add value to a stamp, compared to a nice dated circle cancellation or a 2 ring (or 4 ring) numeral. When I see one, I rather look at centering, perforations, paper and any minor defect first. In the end, value is only a representration of how much someone knowledgeable is prepared to pay for an item, at the time an offer is made.
Thank you for the time youve spent in your reply. Funny how a perspective is always relative. I Have spent the past week going through my cancels and little by little gaining knowledge on those little irritating examples that are left as question marks in the back of your head. when I posted this question it was after taking a good solid count of all those unknowns. For Canada alone the total breached 350. I decided I would post inquiries on those cancels I had least of and so with only a single 7 target ring cancel in my entire small queen I believed that perhaps it was worthy. Lol. when you speak of the RF does that not imply a formula of sorts. For example if a stamp is rated RF8 how would that effect the base value of the stamp it resides upon?
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